pfefferle, 
We just released version 2.0.0 of the #ActivityPub plugin for #WordPress (WordPress.com release is planned for tomorrow).
Main feature: Full bidirectional/threaded comment federation 🎉
Full Changelog: https://github.com/Automattic/wordpress-activitypub/releases/tag/2.0.0
Thanks #Automattic @mattwiebe @kanru @linos @mediaformat @mat @webrocker @sentynel and @janboddez for your contributions