The fediverse is a collection of decentralized online communities that speak the common “language” of ActivityPub. This lets each hub maintain its own rules and members while still allowing posts, likes and other content to appear on others. Meta promised to support the fediverse whenfrom December, Zuckerberg framed the integration as a way to let the young platform’s content reach more eyeballs.
The feature is opt-in. If you toggle fediverse sharing on, people on other ActivityPub servers can search for and follow your profile, see and interact with your posts and share them with users in their compatible fediverse community. Their interactions will be shared with Threads. There are some limitations while the cross-platform compatibility is in beta. Although likes from different platforms will appear on Threads, replies and follows from those communities won’t. In addition, polls and posts with reply controls can’t be shared with non-Threads communities. So, for now, the integration is doing little more than pushing Threads posts to Mastodon and other fediverse communities, along with a few extras.and follow the instructions to opt in and check it out.