What is the fediverse?

Your email address works with all the others. An Orange account writes to a Proton account without a second thought: it is the same open, shared language. The fediverse applies that idea to social networks. Thanks to a common protocol, ActivityPub, independent services like Mastodon or PeerTube talk to each other, exactly like your mailboxes.

So you pick a server, run by a nonprofit, a company or an enthusiast, and you follow people anywhere else on the network. Rules vary from one server to the next, but the conversation flows freely.

Why does it matter? Because nobody owns the whole thing. No billionaire can buy the fediverse, change its rules overnight, or decide what you will see tomorrow morning. If your server takes a direction you dislike, you move elsewhere and your followers come with you. On a centralized network, that option simply does not exist: the Mastodon vs X comparison measures what this changes day to day.

Where it plays out: the Decentralized social networks category presents the alternatives, and the book places this choice within a complete approach built on the DÉCLIC method.