I'd just like to interject for a moment. What you're referring to as Mastodon, is in fact, Fediverse/Mastodon, or as I've recently taken to calling it, Fediverse plus Mastodon. Mastodon is not a social network unto itself, but rather another free component of a fully functioning Fediverse made useful by the GNU Social interoperability, networking tools and vital system components comprising a full Fediverse as defined by the GNU Social standard.
Many users run a modified version of the Fedivers
@kalium_puceon yeah lot of user already know that but if you don't keep quiet new users won't come because they'll think it's overly complex for just sharing cat pictures ;)
@kalium_puceon and even the fediverse isn't all. diaspora* is technically not part of it, and p2p projects like zeronet (very active lately) and secure scuttlebutt / patchwork aren't either.
@pj gnusocial is the early-2010's attempt at federated social media. It didn't do very well but it was designed so that you could extend instances without losing interoperability and a lot of that got used in the newer federated services. They don't really fully meet spec but it's enough and the joke worked.
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!