I've implemented a basic ActivityPub support into owl-blogs.

• Possibility to follow/subscribe to all published entries ActivityPub (e.g. on Mastodon)
• Likes, announces (aka boosts) and replies are tracked on posts (example post with interactions)
• Replies to websites supporting ActivityPub will mention the author.
• Support for hashtags as implemented by Mastodon

Feel free to check out version 0.2.0. Feedback is always appreciated :)