Meta announced that users on Threads will be able to see fediverse replies on other posts besides their own. "Posts that originated through the Threads API, like those created via third-party apps and scheduling services, will now be syndicated to the fediverse. Threads is the largest app to adopt ActivityPub, the protocol powering the fediverse, worrying some that Meta will take over the decentralized, open-source social network made up of interconnected servers.