The fediverse is the network of federated decentralized social media using activitypub to connect. Lemmy (the software on which chapo.chat is based) will be in some months part of this network.
What do you think about fediverse ? Are some of you using Mastodon as a twitter replacement ?
it is useful in that the critical mass of each individual website (or instance in fediverse jargon) is smaller due to the fact interactions come from the network.