Meta announced that users on Threads will be able to see fediverse replies on other posts besides their own. In addition, posts that originated through the Threads API, like those created via third-party apps and scheduling services, will now be syndicated to the fediverse.
Note: You can’t interact with Threads accounts from Lemmy, but you can interact with Threads accounts from MBin (and maybe PieFed), except if your instance is defederated from them obviously
There’s POTUS account for example @potus@threads.net