mastodon.world is one of the many independent Mastodon servers you can use to participate in the fediverse.
Generic Mastodon server for anyone to use.

Server stats:

12K
active users

Walt Mossberg

@mike @Gargron @Mastodon …here’s an example of the complexity here: I just tried to react to a post about my leaving Twitter, and was met with a big notice saying I couldn’t do that because I wasn’t logged into the server where it lived. I thought all the posts and replies were interchangeable among servers.