Automattic, the company who owns WordPress and Tumblr, is testing out the Fediverse (aka Mastodon), the AT protocol (aka (Bluesky), and Nostr.

https://techcrunch.com/2023/03/13/wordpress-com-owner-automattic-acquires-an-activitypub-plugin-so-blogs-can-join-the-fediverse/amp/