Only return certain activities in TwitterAPI mentions.

lib/pleroma/web/twitter_api/twitter_api_controller.ex

@@ -107,6 +107,11 @@ def user_timeline(%{assigns: %{user: user}} = conn, params) do
   end
 
   def mentions_timeline(%{assigns: %{user: user}} = conn, params) do
+    params =
+      params
+      |> Map.put("type", ["Create", "Announce", "Follow", "Like"])
+      |> Map.put("blocking_user", user)
+
     activities = ActivityPub.fetch_activities([user.ap_id], params)
 
     conn