Fediverse

"Threads is deepening its ties to the fediverse, also known as the open social web, which powers services like X alternative Mastodon, Pixelfed, PeerTube, Flipboard and other apps. On Wednesday, 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. The latter had previously been announced via an in-app message informing users that API posts would be shared to the fediverse starting on August 28."