Hey, Mastodon made xkcd!
@peterdrake Are those all correct? Reddit user instances are a thing? Mastodon requires a central server?
@anita_poopegan I'm not sure, but the author tends to know what he's doing. The chart does admit that Mastodon has "user-run instances".
@peterdrake I saw that. It wasn't clear to me in what way Mastodon requires a central server that IRC doesn't. They both need servers - neither is a peer-to-peer protocol - but both work with a federation of coequal servers AIUI.