How does Mastodon work? It says you can't register on mastodon.social anymore because it's too big. If you sign up on different server, can you still interact with people on mastodon.social and other servers...?
Better: you get a local and federated feed, as well as the feed for who you follow. Local is just the server you're signed up to. Fed is "the world" and your follow feed is just that.