Mastodon, which proudly proclaims it is “not for sale” and has around 4.5 million user accounts, is pretty similar to Twitter, once users get past the complicated sign-up process. The main difference is that it’s not one cohesive platform, but actually a collection of different, independently-run and self-funded servers. Users on different servers can still communicate with each other, but anybody can set up their own server, and set their own rules for discussion. Mastodon is a crowdfunded nonprofit, which funds the full-time work of Rochko—its sole employee—and several popular servers.

The platform doesn’t have the power to force server owners to do anything—even comply with basic content moderation standards. That sounds like a recipe for an online haven for far-right trolls. But in practice, many of Mastodon’s servers have stricter rules than Twitter, Rochko says. When hate-speech servers do appear, other servers can band together to block them, essentially ostracizing them from the majority of the platform. “I guess you could call it the democratic process,” Rochko says.