More TwAPI fixes.

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -289,7 +289,7 @@ defp activity_to_status(activity, opts) do
     actor = get_in(activity.data, ["actor"])
     user = User.get_cached_by_ap_id(actor)
     # mentioned_users = Repo.all(from user in User, where: user.ap_id in ^activity.data["to"])
-    mentioned_users = Enum.map(activity.data["to"] || [], fn (ap_id) ->
+    mentioned_users = Enum.map(activity.recipients || [], fn (ap_id) ->
       if ap_id do
         User.get_cached_by_ap_id(ap_id)
       else