diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index 24b4f045a..8485a8009 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -192,12 +192,11 @@ def follow(follower, followed, activity_id \\ nil, local \\ true) do
     end
   end
 
-  def unfollow(follower, followed, local \\ true) do
+  def unfollow(follower, followed, activity_id \\ nil, local \\ true) do
     with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
-         unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
+         unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id),
          {:ok, activity} <- insert(unfollow_data, local),
-         :ok,
-         maybe_federate(activity) do
+         :ok <- maybe_federate(activity) do
       {:ok, activity}
     end
   end
@@ -221,6 +220,29 @@ def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ tru
     end
   end
 
+  def block(blocker, blocked, activity_id \\ nil, local \\ true) do
+    follow_activity = fetch_latest_follow(blocker, blocked)
+
+    if follow_activity do
+      unfollow(blocker, blocked, nil, local)
+    end
+
+    with block_data <- make_block_data(blocker, blocked, activity_id),
+         {:ok, activity} <- insert(block_data, local),
+         :ok <- maybe_federate(activity) do
+      {:ok, activity}
+    end
+  end
+
+  def unblock(blocker, blocked, activity_id \\ nil, local \\ true) do
+    with %Activity{} = block_activity <- fetch_latest_block(blocker, blocked),
+         unblock_data <- make_unblock_data(blocker, blocked, block_activity, activity_id),
+         {:ok, activity} <- insert(unblock_data, local),
+         :ok <- maybe_federate(activity) do
+      {:ok, activity}
+    end
+  end
+
   def fetch_activities_for_context(context, opts \\ %{}) do
     public = ["https://www.w3.org/ns/activitystreams#Public"]
 
diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 7d6fd8632..803445011 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -241,6 +241,56 @@ def handle_incoming(
     end
   end
 
+  def handle_incoming(
+        %{
+          "type" => "Undo",
+          "object" => %{"type" => "Follow", "object" => followed},
+          "actor" => follower,
+          "id" => id
+        } = _data
+      ) do
+    with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
+         %User{} = follower <- User.get_or_fetch_by_ap_id(follower),
+         {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
+      User.unfollow(follower, followed)
+      {:ok, activity}
+    else
+      e -> :error
+    end
+  end
+
+  def handle_incoming(
+        %{
+          "type" => "Undo",
+          "object" => %{"type" => "Block", "object" => blocked},
+          "actor" => blocker,
+          "id" => id
+        } = _data
+      ) do
+    with %User{local: true} = blocked <- User.get_cached_by_ap_id(blocked),
+         %User{} = blocker <- User.get_or_fetch_by_ap_id(blocker),
+         {:ok, activity} <- ActivityPub.unblock(blocker, blocked, id, false) do
+      User.unblock(blocker, blocked)
+      {:ok, activity}
+    else
+      e -> :error
+    end
+  end
+
+  def handle_incoming(
+        %{"type" => "Block", "object" => blocked, "actor" => blocker, "id" => id} = data
+      ) do
+    with %User{local: true} = blocked = User.get_cached_by_ap_id(blocked),
+         %User{} = blocker = User.get_or_fetch_by_ap_id(blocker),
+         {:ok, activity} <- ActivityPub.block(blocker, blocked, id, false) do
+      User.unfollow(blocker, blocked)
+      User.block(blocker, blocked)
+      {:ok, activity}
+    else
+      e -> :error
+    end
+  end
+
   def handle_incoming(
         %{
           "type" => "Undo",
@@ -261,7 +311,6 @@ def handle_incoming(
 
   # TODO
   # Accept
-  # Undo for non-Announce
 
   def handle_incoming(_), do: :error
 
diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
index a3feca480..831e13b7e 100644
--- a/lib/pleroma/web/activity_pub/utils.ex
+++ b/lib/pleroma/web/activity_pub/utils.ex
@@ -347,13 +347,56 @@ def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
 
   #### Unfollow-related helpers
 
-  def make_unfollow_data(follower, followed, follow_activity) do
-    %{
+  def make_unfollow_data(follower, followed, follow_activity, activity_id) do
+    data = %{
       "type" => "Undo",
       "actor" => follower.ap_id,
       "to" => [followed.ap_id],
-      "object" => follow_activity.data["id"]
+      "object" => follow_activity.data
     }
+
+    if activity_id, do: Map.put(data, "id", activity_id), else: data
+  end
+
+  #### Block-related helpers
+  def fetch_latest_block(%User{ap_id: blocker_id}, %User{ap_id: blocked_id}) do
+    query =
+      from(
+        activity in Activity,
+        where:
+          fragment(
+            "? @> ?",
+            activity.data,
+            ^%{type: "Block", object: blocked_id}
+          ),
+        where: activity.actor == ^blocker_id,
+        order_by: [desc: :id],
+        limit: 1
+      )
+
+    Repo.one(query)
+  end
+
+  def make_block_data(blocker, blocked, activity_id) do
+    data = %{
+      "type" => "Block",
+      "actor" => blocker.ap_id,
+      "to" => [blocked.ap_id],
+      "object" => blocked.ap_id
+    }
+
+    if activity_id, do: Map.put(data, "id", activity_id), else: data
+  end
+
+  def make_unblock_data(blocker, blocked, block_activity, activity_id) do
+    data = %{
+      "type" => "Undo",
+      "actor" => blocker.ap_id,
+      "to" => [blocked.ap_id],
+      "object" => block_activity.data
+    }
+
+    if activity_id, do: Map.put(data, "id", activity_id), else: data
   end
 
   #### Create-related helpers
diff --git a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
index e6365620e..2c0277124 100644
--- a/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
+++ b/lib/pleroma/web/mastodon_api/mastodon_api_controller.ex
@@ -453,24 +453,18 @@ def follow(%{assigns: %{user: follower}} = conn, %{"uri" => uri}) do
     end
   end
 
-  # TODO: Clean up and unify
   def unfollow(%{assigns: %{user: follower}} = conn, %{"id" => id}) do
     with %User{} = followed <- Repo.get(User, id),
-         {:ok, follower, follow_activity} <- User.unfollow(follower, followed),
-         {:ok, _activity} <-
-           ActivityPub.insert(%{
-             "type" => "Undo",
-             "actor" => follower.ap_id,
-             # get latest Follow for these users
-             "object" => follow_activity.data["id"]
-           }) do
+         {:ok, _activity} <- ActivityPub.unfollow(follower, followed),
+         {:ok, follower, _} <- User.unfollow(follower, followed) do
       render(conn, AccountView, "relationship.json", %{user: follower, target: followed})
     end
   end
 
   def block(%{assigns: %{user: blocker}} = conn, %{"id" => id}) do
     with %User{} = blocked <- Repo.get(User, id),
-         {:ok, blocker} <- User.block(blocker, blocked) do
+         {:ok, blocker} <- User.block(blocker, blocked),
+         {:ok, _activity} <- ActivityPub.block(blocker, blocked) do
       render(conn, AccountView, "relationship.json", %{user: blocker, target: blocked})
     else
       {:error, message} ->
@@ -482,7 +476,8 @@ def block(%{assigns: %{user: blocker}} = conn, %{"id" => id}) do
 
   def unblock(%{assigns: %{user: blocker}} = conn, %{"id" => id}) do
     with %User{} = blocked <- Repo.get(User, id),
-         {:ok, blocker} <- User.unblock(blocker, blocked) do
+         {:ok, blocker} <- User.unblock(blocker, blocked),
+         {:ok, _activity} <- ActivityPub.unblock(blocker, blocked) do
       render(conn, AccountView, "relationship.json", %{user: blocker, target: blocked})
     else
       {:error, message} ->
diff --git a/lib/pleroma/web/ostatus/activity_representer.ex b/lib/pleroma/web/ostatus/activity_representer.ex
index 64cadba1b..4179d86c9 100644
--- a/lib/pleroma/web/ostatus/activity_representer.ex
+++ b/lib/pleroma/web/ostatus/activity_representer.ex
@@ -232,7 +232,12 @@ def to_simple_form(%{data: %{"type" => "Follow"}} = activity, user, with_author)
   end
 
   # Only undos of follow for now. Will need to get redone once there are more
-  def to_simple_form(%{data: %{"type" => "Undo"}} = activity, user, with_author) do
+  def to_simple_form(
+        %{data: %{"type" => "Undo", "object" => %{"type" => "Follow"} = follow_activity}} =
+          activity,
+        user,
+        with_author
+      ) do
     h = fn str -> [to_charlist(str)] end
 
     updated_at = activity.data["published"]
@@ -240,34 +245,26 @@ def to_simple_form(%{data: %{"type" => "Undo"}} = activity, user, with_author) d
 
     author = if with_author, do: [{:author, UserRepresenter.to_simple_form(user)}], else: []
 
-    follow_activity =
-      if is_map(activity.data["object"]) do
-        Activity.get_by_ap_id(activity.data["object"]["id"])
-      else
-        Activity.get_by_ap_id(activity.data["object"])
-      end
-
     mentions = (activity.recipients || []) |> get_mentions
+    follow_activity = Activity.get_by_ap_id(follow_activity["id"])
 
-    if follow_activity do
-      [
-        {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
-        {:"activity:verb", ['http://activitystrea.ms/schema/1.0/unfollow']},
-        {:id, h.(activity.data["id"])},
-        {:title, ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
-        {:content, [type: 'html'],
-         ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
-        {:published, h.(inserted_at)},
-        {:updated, h.(updated_at)},
-        {:"activity:object",
-         [
-           {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
-           {:id, h.(follow_activity.data["object"])},
-           {:uri, h.(follow_activity.data["object"])}
-         ]},
-        {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
-      ] ++ mentions ++ author
-    end
+    [
+      {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/activity']},
+      {:"activity:verb", ['http://activitystrea.ms/schema/1.0/unfollow']},
+      {:id, h.(activity.data["id"])},
+      {:title, ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
+      {:content, [type: 'html'],
+       ['#{user.nickname} stopped following #{follow_activity.data["object"]}']},
+      {:published, h.(inserted_at)},
+      {:updated, h.(updated_at)},
+      {:"activity:object",
+       [
+         {:"activity:object-type", ['http://activitystrea.ms/schema/1.0/person']},
+         {:id, h.(follow_activity.data["object"])},
+         {:uri, h.(follow_activity.data["object"])}
+       ]},
+      {:link, [rel: 'self', type: ['application/atom+xml'], href: h.(activity.data["id"])], []}
+    ] ++ mentions ++ author
   end
 
   def to_simple_form(%{data: %{"type" => "Delete"}} = activity, user, with_author) do
diff --git a/lib/pleroma/web/ostatus/handlers/unfollow_handler.ex b/lib/pleroma/web/ostatus/handlers/unfollow_handler.ex
new file mode 100644
index 000000000..a115bf4c8
--- /dev/null
+++ b/lib/pleroma/web/ostatus/handlers/unfollow_handler.ex
@@ -0,0 +1,17 @@
+defmodule Pleroma.Web.OStatus.UnfollowHandler do
+  alias Pleroma.Web.{XML, OStatus}
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.User
+
+  def handle(entry, doc) do
+    with {:ok, actor} <- OStatus.find_make_or_update_user(doc),
+         id when not is_nil(id) <- XML.string_from_xpath("/entry/id", entry),
+         followed_uri when not is_nil(followed_uri) <-
+           XML.string_from_xpath("/entry/activity:object/id", entry),
+         {:ok, followed} <- OStatus.find_or_make_user(followed_uri),
+         {:ok, activity} <- ActivityPub.unfollow(actor, followed, id, false) do
+      User.unfollow(actor, followed)
+      {:ok, activity}
+    end
+  end
+end
diff --git a/lib/pleroma/web/ostatus/ostatus.ex b/lib/pleroma/web/ostatus/ostatus.ex
index 5c4a1fd69..f0ff0624f 100644
--- a/lib/pleroma/web/ostatus/ostatus.ex
+++ b/lib/pleroma/web/ostatus/ostatus.ex
@@ -8,7 +8,7 @@ defmodule Pleroma.Web.OStatus do
   alias Pleroma.{Repo, User, Web, Object, Activity}
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.{WebFinger, Websub}
-  alias Pleroma.Web.OStatus.{FollowHandler, NoteHandler, DeleteHandler}
+  alias Pleroma.Web.OStatus.{FollowHandler, UnfollowHandler, NoteHandler, DeleteHandler}
   alias Pleroma.Web.ActivityPub.Transmogrifier
 
   def feed_path(user) do
@@ -47,6 +47,9 @@ def handle_incoming(xml_string) do
               'http://activitystrea.ms/schema/1.0/follow' ->
                 with {:ok, activity} <- FollowHandler.handle(entry, doc), do: activity
 
+              'http://activitystrea.ms/schema/1.0/unfollow' ->
+                with {:ok, activity} <- UnfollowHandler.handle(entry, doc), do: activity
+
               'http://activitystrea.ms/schema/1.0/share' ->
                 with {:ok, activity, retweeted_activity} <- handle_share(entry, doc),
                      do: [activity, retweeted_activity]
diff --git a/lib/pleroma/web/twitter_api/representers/activity_representer.ex b/lib/pleroma/web/twitter_api/representers/activity_representer.ex
index c2e1f07a5..57837205e 100644
--- a/lib/pleroma/web/twitter_api/representers/activity_representer.ex
+++ b/lib/pleroma/web/twitter_api/representers/activity_representer.ex
@@ -99,7 +99,7 @@ def to_map(
       ) do
     created_at = created_at |> Utils.date_to_asctime()
 
-    text = "#{user.nickname} undid the action at #{undid_activity}"
+    text = "#{user.nickname} undid the action at #{undid_activity["id"]}"
 
     %{
       "id" => activity.id,
diff --git a/lib/pleroma/web/twitter_api/twitter_api.ex b/lib/pleroma/web/twitter_api/twitter_api.ex
index 722e436e2..3ccdaed6f 100644
--- a/lib/pleroma/web/twitter_api/twitter_api.ex
+++ b/lib/pleroma/web/twitter_api/twitter_api.ex
@@ -36,14 +36,7 @@ def follow(%User{} = follower, params) do
   def unfollow(%User{} = follower, params) do
     with {:ok, %User{} = unfollowed} <- get_user(params),
          {:ok, follower, follow_activity} <- User.unfollow(follower, unfollowed),
-         {:ok, _activity} <-
-           ActivityPub.insert(%{
-             "type" => "Undo",
-             "actor" => follower.ap_id,
-             # get latest Follow for these users
-             "object" => follow_activity.data["id"],
-             "published" => make_date()
-           }) do
+         {:ok, _activity} <- ActivityPub.unfollow(follower, unfollowed) do
       {:ok, follower, unfollowed}
     else
       err -> err
@@ -52,7 +45,8 @@ def unfollow(%User{} = follower, params) do
 
   def block(%User{} = blocker, params) do
     with {:ok, %User{} = blocked} <- get_user(params),
-         {:ok, blocker} <- User.block(blocker, blocked) do
+         {:ok, blocker} <- User.block(blocker, blocked),
+         {:ok, _activity} <- ActivityPub.block(blocker, blocked) do
       {:ok, blocker, blocked}
     else
       err -> err
@@ -61,7 +55,8 @@ def block(%User{} = blocker, params) do
 
   def unblock(%User{} = blocker, params) do
     with {:ok, %User{} = blocked} <- get_user(params),
-         {:ok, blocker} <- User.unblock(blocker, blocked) do
+         {:ok, blocker} <- User.unblock(blocker, blocked),
+         {:ok, _activity} <- ActivityPub.unblock(blocker, blocked) do
       {:ok, blocker, blocked}
     else
       err -> err
diff --git a/test/fixtures/mastodon-block-activity.json b/test/fixtures/mastodon-block-activity.json
new file mode 100644
index 000000000..186719d2c
--- /dev/null
+++ b/test/fixtures/mastodon-block-activity.json
@@ -0,0 +1,29 @@
+{
+  "type": "Block",
+  "signature": {
+    "type": "RsaSignature2017",
+    "signatureValue": "Kn1/UkAQGJVaXBfWLAHcnwHg8YMAUqlEaBuYLazAG+pz5hqivsyrBmPV186Xzr+B4ZLExA9+SnOoNx/GOz4hBm0kAmukNSILAsUd84tcJ2yT9zc1RKtembK4WiwOw7li0+maeDN0HaB6t+6eTqsCWmtiZpprhXD8V1GGT8yG7X24fQ9oFGn+ng7lasbcCC0988Y1eGqNe7KryxcPuQz57YkDapvtONzk8gyLTkZMV4De93MyRHq6GVjQVIgtiYabQAxrX6Q8C+4P/jQoqdWJHEe+MY5JKyNaT/hMPt2Md1ok9fZQBGHlErk22/zy8bSN19GdG09HmIysBUHRYpBLig==",
+    "creator": "http://mastodon.example.org/users/admin#main-key",
+    "created": "2018-02-17T13:29:31Z"
+  },
+  "object": "http://localtesting.pleroma.lol/users/lain",
+  "nickname": "lain",
+  "id": "http://mastodon.example.org/users/admin#follows/2",
+  "actor": "http://mastodon.example.org/users/admin",
+  "@context": [
+    "https://www.w3.org/ns/activitystreams",
+    "https://w3id.org/security/v1",
+    {
+      "toot": "http://joinmastodon.org/ns#",
+      "sensitive": "as:sensitive",
+      "ostatus": "http://ostatus.org#",
+      "movedTo": "as:movedTo",
+      "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
+      "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
+      "conversation": "ostatus:conversation",
+      "atomUri": "ostatus:atomUri",
+      "Hashtag": "as:Hashtag",
+      "Emoji": "toot:Emoji"
+    }
+  ]
+}
diff --git a/test/fixtures/mastodon-unblock-activity.json b/test/fixtures/mastodon-unblock-activity.json
new file mode 100644
index 000000000..f4a2d30dd
--- /dev/null
+++ b/test/fixtures/mastodon-unblock-activity.json
@@ -0,0 +1,34 @@
+{
+    "@context": [
+            "https://www.w3.org/ns/activitystreams",
+            "https://w3id.org/security/v1",
+            {
+              "toot": "http://joinmastodon.org/ns#",
+              "sensitive": "as:sensitive",
+              "ostatus": "http://ostatus.org#",
+              "movedTo": "as:movedTo",
+              "manuallyApprovesFollowers": "as:manuallyApprovesFollowers",
+              "inReplyToAtomUri": "ostatus:inReplyToAtomUri",
+              "conversation": "ostatus:conversation",
+              "atomUri": "ostatus:atomUri",
+              "Hashtag": "as:Hashtag",
+              "Emoji": "toot:Emoji"
+            }
+          ],
+    "signature": {
+        "type": "RsaSignature2017",
+        "signatureValue": "Kn1/UkAQGJVaXBfWLAHcnwHg8YMAUqlEaBuYLazAG+pz5hqivsyrBmPV186Xzr+B4ZLExA9+SnOoNx/GOz4hBm0kAmukNSILAsUd84tcJ2yT9zc1RKtembK4WiwOw7li0+maeDN0HaB6t+6eTqsCWmtiZpprhXD8V1GGT8yG7X24fQ9oFGn+ng7lasbcCC0988Y1eGqNe7KryxcPuQz57YkDapvtONzk8gyLTkZMV4De93MyRHq6GVjQVIgtiYabQAxrX6Q8C+4P/jQoqdWJHEe+MY5JKyNaT/hMPt2Md1ok9fZQBGHlErk22/zy8bSN19GdG09HmIysBUHRYpBLig==",
+        "creator": "http://mastodon.example.org/users/admin#main-key",
+        "created": "2018-02-17T13:29:31Z"
+      },
+    "type": "Undo",
+    "object": {
+      "type": "Block", 
+      "object": "http://localtesting.pleroma.lol/users/lain",
+      "nickname": "lain",
+      "id": "http://mastodon.example.org/users/admin#blocks/2",
+      "actor": "http://mastodon.example.org/users/admin" 
+    },
+    "actor": "http://mastodon.example.org/users/admin",
+    "id": "http://mastodon.example.org/users/admin#blocks/2/undo"
+}
diff --git a/test/fixtures/mastodon-unfollow-activity.json b/test/fixtures/mastodon-unfollow-activity.json
new file mode 100644
index 000000000..ae5ab7c66
--- /dev/null
+++ b/test/fixtures/mastodon-unfollow-activity.json
@@ -0,0 +1,34 @@
+{
+   "@context":[
+      "https://www.w3.org/ns/activitystreams",
+      "https://w3id.org/security/v1",
+      {
+         "toot":"http://joinmastodon.org/ns#",
+         "sensitive":"as:sensitive",
+         "ostatus":"http://ostatus.org#",
+         "movedTo":"as:movedTo",
+         "manuallyApprovesFollowers":"as:manuallyApprovesFollowers",
+         "inReplyToAtomUri":"ostatus:inReplyToAtomUri",
+         "conversation":"ostatus:conversation",
+         "atomUri":"ostatus:atomUri",
+         "Hashtag":"as:Hashtag",
+         "Emoji":"toot:Emoji"
+      }
+   ],
+   "signature":{
+      "type":"RsaSignature2017",
+      "signatureValue":"Kn1/UkAQGJVaXBfWLAHcnwHg8YMAUqlEaBuYLazAG+pz5hqivsyrBmPV186Xzr+B4ZLExA9+SnOoNx/GOz4hBm0kAmukNSILAsUd84tcJ2yT9zc1RKtembK4WiwOw7li0+maeDN0HaB6t+6eTqsCWmtiZpprhXD8V1GGT8yG7X24fQ9oFGn+ng7lasbcCC0988Y1eGqNe7KryxcPuQz57YkDapvtONzk8gyLTkZMV4De93MyRHq6GVjQVIgtiYabQAxrX6Q8C+4P/jQoqdWJHEe+MY5JKyNaT/hMPt2Md1ok9fZQBGHlErk22/zy8bSN19GdG09HmIysBUHRYpBLig==",
+      "creator":"http://mastodon.example.org/users/admin#main-key",
+      "created":"2018-02-17T13:29:31Z"
+   },
+   "type":"Undo",
+   "object":{
+      "type":"Follow",
+      "object":"http://localtesting.pleroma.lol/users/lain",
+      "nickname":"lain",
+      "id":"http://mastodon.example.org/users/admin#follows/2",
+      "actor":"http://mastodon.example.org/users/admin"
+   },
+   "actor":"http://mastodon.example.org/users/admin",
+   "id": "http://mastodon.example.org/users/admin#follow/2/undo"
+}
diff --git a/test/fixtures/unfollow.xml b/test/fixtures/unfollow.xml
new file mode 100644
index 000000000..7a8f8fd2e
--- /dev/null
+++ b/test/fixtures/unfollow.xml
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xmlns:georss="http://www.georss.org/georss" xmlns:activity="http://activitystrea.ms/spec/1.0/" xmlns:media="http://purl.org/syndication/atommedia" xmlns:poco="http://portablecontacts.net/spec/1.0" xmlns:ostatus="http://ostatus.org/schema/1.0" xmlns:statusnet="http://status.net/schema/api/1/">
+ <generator uri="https://gnu.io/social" version="1.0.2-dev">GNU social</generator>
+ <id>https://social.heldscal.la/api/statuses/user_timeline/23211.atom</id>
+ <title>lambadalambda timeline</title>
+ <subtitle>Updates from lambadalambda on social.heldscal.la!</subtitle>
+ <logo>https://social.heldscal.la/avatar/23211-96-20170416114255.jpeg</logo>
+ <updated>2017-05-07T09:54:49+00:00</updated>
+<author>
+ <activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
+ <uri>https://social.heldscal.la/user/23211</uri>
+ <name>lambadalambda</name>
+ <summary>Call me Deacon Blues.</summary>
+ <link rel="alternate" type="text/html" href="https://social.heldscal.la/lambadalambda"/>
+ <link rel="avatar" type="image/jpeg" media:width="236" media:height="236" href="https://social.heldscal.la/avatar/23211-original-20170416114255.jpeg"/>
+ <link rel="avatar" type="image/jpeg" media:width="96" media:height="96" href="https://social.heldscal.la/avatar/23211-96-20170416114255.jpeg"/>
+ <link rel="avatar" type="image/jpeg" media:width="48" media:height="48" href="https://social.heldscal.la/avatar/23211-48-20170416114255.jpeg"/>
+ <link rel="avatar" type="image/jpeg" media:width="24" media:height="24" href="https://social.heldscal.la/avatar/23211-24-20170416114257.jpeg"/>
+ <poco:preferredUsername>lambadalambda</poco:preferredUsername>
+ <poco:displayName>Constance Variable</poco:displayName>
+ <poco:note>Call me Deacon Blues.</poco:note>
+ <poco:address>
+  <poco:formatted>Berlin</poco:formatted>
+ </poco:address>
+ <poco:urls>
+  <poco:type>homepage</poco:type>
+  <poco:value>https://heldscal.la</poco:value>
+  <poco:primary>true</poco:primary>
+ </poco:urls>
+ <followers url="https://social.heldscal.la/lambadalambda/subscribers"></followers>
+ <statusnet:profile_info local_id="23211"></statusnet:profile_info>
+</author>
+ <link href="https://social.heldscal.la/lambadalambda" rel="alternate" type="text/html"/>
+ <link href="https://social.heldscal.la/main/sup" rel="http://api.friendfeed.com/2008/03#sup" type="application/json"/>
+ <link href="https://social.heldscal.la/main/push/hub" rel="hub"/>
+ <link href="https://social.heldscal.la/main/salmon/user/23211" rel="salmon"/>
+ <link href="https://social.heldscal.la/main/salmon/user/23211" rel="http://salmon-protocol.org/ns/salmon-replies"/>
+ <link href="https://social.heldscal.la/main/salmon/user/23211" rel="http://salmon-protocol.org/ns/salmon-mention"/>
+ <link href="https://social.heldscal.la/api/statuses/user_timeline/23211.atom" rel="self" type="application/atom+xml"/>
+<entry>
+ <id>undo:tag:social.heldscal.la,2017-05-07:subscription:23211:person:44803:2017-05-07T09:54:48+00:00</id>
+ <title>Constance Variable (lambadalambda@social.heldscal.la)'s status on Sunday, 07-May-2017 09:54:49 UTC</title>
+ <content type="html">&lt;a href=&quot;https://social.heldscal.la/lambadalambda&quot;&gt;Constance Variable&lt;/a&gt; stopped following &lt;a href=&quot;https://pawoo.net/@pekorino&quot;&gt;ｍｏｎｏ&lt;/a&gt;.</content>
+ <link rel="alternate" type="text/html" href="https://social.heldscal.la/notice/2092981"/>
+ <activity:verb>http://activitystrea.ms/schema/1.0/unfollow</activity:verb>
+ <published>2017-05-07T09:54:49+00:00</published>
+ <updated>2017-05-07T09:54:49+00:00</updated>
+ <activity:object>
+  <activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
+  <id>https://pawoo.net/users/pekorino</id>
+  <title>ｍｏｎｏ</title>
+  <summary>http://shitposter.club/mono   孤独のグルメ</summary>
+  <link rel="alternate" type="text/html" href="https://pawoo.net/@pekorino"/>
+  <link rel="avatar" type="image/png" media:width="96" media:height="96" href="http://social.heldscal.la/theme/neo-gnu/default-avatar-profile.png"/>
+  <link rel="avatar" type="image/png" media:width="48" media:height="48" href="http://social.heldscal.la/theme/neo-gnu/default-avatar-stream.png"/>
+  <link rel="avatar" type="image/png" media:width="24" media:height="24" href="http://social.heldscal.la/theme/neo-gnu/default-avatar-mini.png"/>
+  <poco:preferredUsername>pekorino</poco:preferredUsername>
+  <poco:displayName>ｍｏｎｏ</poco:displayName>
+  <poco:note>http://shitposter.club/mono   孤独のグルメ</poco:note>
+ </activity:object>
+ <link rel="ostatus:conversation" href="https://social.heldscal.la/conversation/1079786"/>
+ <ostatus:conversation href="https://social.heldscal.la/conversation/1079786" local_id="1079786" ref="tag:social.heldscal.la,2017-05-07:objectType=thread:nonce=6e80caf94e03029f">tag:social.heldscal.la,2017-05-07:objectType=thread:nonce=6e80caf94e03029f</ostatus:conversation>
+ <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/collection" href="http://activityschema.org/collection/public"/>
+ <link rel="self" type="application/atom+xml" href="https://social.heldscal.la/api/statuses/show/2092981.atom"/>
+ <link rel="edit" type="application/atom+xml" href="https://social.heldscal.la/api/statuses/show/2092981.atom"/>
+ <statusnet:notice_info local_id="2092981" source="activity"></statusnet:notice_info>
+</entry>
+</feed>
diff --git a/test/web/activity_pub/activity_pub_test.exs b/test/web/activity_pub/activity_pub_test.exs
index 9adce84b5..081c202b1 100644
--- a/test/web/activity_pub/activity_pub_test.exs
+++ b/test/web/activity_pub/activity_pub_test.exs
@@ -425,7 +425,40 @@ test "creates an undo activity for the last follow" do
 
       assert activity.data["type"] == "Undo"
       assert activity.data["actor"] == follower.ap_id
-      assert activity.data["object"] == follow_activity.data["id"]
+
+      assert is_map(activity.data["object"])
+      assert activity.data["object"]["type"] == "Follow"
+      assert activity.data["object"]["object"] == followed.ap_id
+      assert activity.data["object"]["id"] == follow_activity.data["id"]
+    end
+  end
+
+  describe "blocking / unblocking" do
+    test "creates a block activity" do
+      blocker = insert(:user)
+      blocked = insert(:user)
+
+      {:ok, activity} = ActivityPub.block(blocker, blocked)
+
+      assert activity.data["type"] == "Block"
+      assert activity.data["actor"] == blocker.ap_id
+      assert activity.data["object"] == blocked.ap_id
+    end
+
+    test "creates an undo activity for the last block" do
+      blocker = insert(:user)
+      blocked = insert(:user)
+
+      {:ok, block_activity} = ActivityPub.block(blocker, blocked)
+      {:ok, activity} = ActivityPub.unblock(blocker, blocked)
+
+      assert activity.data["type"] == "Undo"
+      assert activity.data["actor"] == blocker.ap_id
+
+      assert is_map(activity.data["object"])
+      assert activity.data["object"]["type"] == "Block"
+      assert activity.data["object"]["object"] == blocked.ap_id
+      assert activity.data["object"]["id"] == block_activity.data["id"]
     end
   end
 
diff --git a/test/web/activity_pub/transmogrifier_test.exs b/test/web/activity_pub/transmogrifier_test.exs
index a0af75a69..cf6b1d0b5 100644
--- a/test/web/activity_pub/transmogrifier_test.exs
+++ b/test/web/activity_pub/transmogrifier_test.exs
@@ -315,6 +315,76 @@ test "it works for incoming unannounces with an existing notice" do
       assert data["object"]["id"] ==
                "http://mastodon.example.org/users/admin/statuses/99542391527669785/activity"
     end
+
+    test "it works for incomming unfollows with an existing follow" do
+      user = insert(:user)
+
+      follow_data =
+        File.read!("test/fixtures/mastodon-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: _, local: false}} = Transmogrifier.handle_incoming(follow_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-unfollow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", follow_data)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Undo"
+      assert data["object"]["type"] == "Follow"
+      assert data["object"]["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      refute User.following?(User.get_by_ap_id(data["actor"]), user)
+    end
+
+    test "it works for incoming blocks" do
+      user = insert(:user)
+
+      data =
+        File.read!("test/fixtures/mastodon-block-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+
+      assert data["type"] == "Block"
+      assert data["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      blocker = User.get_by_ap_id(data["actor"])
+
+      assert User.blocks?(blocker, user)
+    end
+
+    test "it works for incoming unblocks with an existing block" do
+      user = insert(:user)
+
+      block_data =
+        File.read!("test/fixtures/mastodon-block-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      {:ok, %Activity{data: _, local: false}} = Transmogrifier.handle_incoming(block_data)
+
+      data =
+        File.read!("test/fixtures/mastodon-unblock-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", block_data)
+
+      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+      assert data["type"] == "Undo"
+      assert data["object"]["type"] == "Block"
+      assert data["object"]["object"] == user.ap_id
+      assert data["actor"] == "http://mastodon.example.org/users/admin"
+
+      blocker = User.get_by_ap_id(data["actor"])
+
+      refute User.blocks?(blocker, user)
+    end
   end
 
   describe "prepare outgoing" do
diff --git a/test/web/ostatus/ostatus_test.exs b/test/web/ostatus/ostatus_test.exs
index 3e7cf0155..f095e41dd 100644
--- a/test/web/ostatus/ostatus_test.exs
+++ b/test/web/ostatus/ostatus_test.exs
@@ -278,6 +278,30 @@ test "handle incoming follows" do
     assert User.following?(follower, followed)
   end
 
+  test "handle incoming unfollows with existing follow" do
+    incoming_follow = File.read!("test/fixtures/follow.xml")
+    {:ok, [_activity]} = OStatus.handle_incoming(incoming_follow)
+
+    incoming = File.read!("test/fixtures/unfollow.xml")
+    {:ok, [activity]} = OStatus.handle_incoming(incoming)
+
+    assert activity.data["type"] == "Undo"
+
+    assert activity.data["id"] ==
+             "undo:tag:social.heldscal.la,2017-05-07:subscription:23211:person:44803:2017-05-07T09:54:48+00:00"
+
+    assert activity.data["actor"] == "https://social.heldscal.la/user/23211"
+    assert is_map(activity.data["object"])
+    assert activity.data["object"]["type"] == "Follow"
+    assert activity.data["object"]["object"] == "https://pawoo.net/users/pekorino"
+    refute activity.local
+
+    follower = User.get_by_ap_id(activity.data["actor"])
+    followed = User.get_by_ap_id(activity.data["object"]["object"])
+
+    refute User.following?(follower, followed)
+  end
+
   describe "new remote user creation" do
     test "returns local users" do
       local_user = insert(:user)
diff --git a/test/web/twitter_api/twitter_api_controller_test.exs b/test/web/twitter_api/twitter_api_controller_test.exs
index 73443e053..c2ea41aa3 100644
--- a/test/web/twitter_api/twitter_api_controller_test.exs
+++ b/test/web/twitter_api/twitter_api_controller_test.exs
@@ -444,7 +444,7 @@ test "without valid credentials", %{conn: conn} do
     test "with credentials", %{conn: conn, user: current_user} do
       blocked = insert(:user)
 
-      {:ok, current_user} = User.block(current_user, blocked)
+      {:ok, current_user, blocked} = TwitterAPI.block(current_user, %{"user_id" => blocked.id})
       assert User.blocks?(current_user, blocked)
 
       conn =
diff --git a/test/web/twitter_api/twitter_api_test.exs b/test/web/twitter_api/twitter_api_test.exs
index af565c0e5..4716abb84 100644
--- a/test/web/twitter_api/twitter_api_test.exs
+++ b/test/web/twitter_api/twitter_api_test.exs
@@ -166,7 +166,7 @@ test "Block another user using screen_name" do
   test "Unblock another user using user_id" do
     unblocked = insert(:user)
     user = insert(:user)
-    User.block(user, unblocked)
+    {:ok, user, _unblocked} = TwitterAPI.block(user, %{"user_id" => unblocked.id})
 
     {:ok, user, _unblocked} = TwitterAPI.unblock(user, %{"user_id" => unblocked.id})
     assert user.info["blocks"] == []
@@ -175,7 +175,7 @@ test "Unblock another user using user_id" do
   test "Unblock another user using screen_name" do
     unblocked = insert(:user)
     user = insert(:user)
-    User.block(user, unblocked)
+    {:ok, user, _unblocked} = TwitterAPI.block(user, %{"screen_name" => unblocked.nickname})
 
     {:ok, user, _unblocked} = TwitterAPI.unblock(user, %{"screen_name" => unblocked.nickname})
     assert user.info["blocks"] == []