If you’re actively blogging on WordPress and have been playing with Mastodon et al. in the past few months, you probably came across the ActivityPub plugin for WordPress.
The plugin implements the ActivityPub protocol for your site. It allows others to follow your blog from their Mastodon / Pleroma / GoToSocial account. If they reply to one of your blog’s posts there, their reply will be posted as a comment on your blog.
This is already pretty neat! But starting today with the release of version 0.16.1 of the plugin, you can even mention other ActivityPub users in your posts. When you hit Publish, they’ll be notified of your post inside their client of choice.