@uoou "The federated timeline shows all public posts from all users who are “known” to your instance. That is, it includes every user on your instance, but it also includes everyone that users on your instance follow – even if those users are on other servers. It’s not the same thing as “every user on mastodon” though."
Info from https://blog.djnavarro.net/posts/2022-11-03_what-i-know-about-mastodon/