Social networking is often approached by the free-software community with a certain amount of suspicion—rightly so, since commercial social networks almost always generate revenue by exploiting user data in one way or another. While attempts at a free-software approach to social networking have so far not met widespread success, the new ActivityPub federation protocol and its implementation in the free-software microblogging system Mastodon are gaining popularity and already show some of the advantages of a community-driven approach.