The US President's official Threads account, currently run by President Joe Biden, has begun using Meta's ActivityPub integration, making Biden the first sitting US president to post on the decentralized network protocol. If you want to follow the President's posts, but don't want to leave Mastodon, you can follow @[email protected].
Here is the account seen from the official Mastodon client:
Biden may not be able to see responses and follow-ups as they come in from the facebook, and with some servers. block connections to Meta, not everyone present will be able to see your posts, as those features were not part of the Threads integration when it opened beta testing last month. But your posts are available and you will see likes from there. Or whoever is managing the Presidential Threads account will, anyway.
So far, only Biden's official POTUS account appears to have activated Threads' fediverse integration. Neither Dr. Jill Biden's nor Vice President Kamala Harris' accounts appeared in a search. And none of them appear to have yet joined Bluesky, a competing decentralized social network that runs on its own AT protocol and recently opened general registrations.