WordPress can @mention a user
August 10, 2020
I haven’t heard a dang thing about it, but apparently it’s possible to reference anyone who is a registered user of your WordPress site using @mentions.
If you’re wondering what the heck an @mention is, it’s the same sort of thing you’d use to reply or mention another Twitter user in a tweet.
In WordPress, it’s done directly in the post block editor. Type @
and a contextual menu pops up that suggests matching users that autocomplete when selected.
I’m honestly not sure what this is useful for! From what I can tell, it merely prints the person’s username. No links. No notifications. Just plain text.

Comments
Automattic just relaunched P2, which seems to have pivoted from WP theme for team collaboration to SaaS (it still is a WP.com blog underneath). And there, @mentions are a feature. Maybe @mentions made it to core WP because of this.
I saw that, but didn’t make the connection! That would be super interesting, especially if the updated P2 makes it to self-hosted WordPress.