mastodon.social is one of the many independent Mastodon servers you can use to participate in the fediverse.
The original server operated by the Mastodon gGmbH non-profit

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active users

PuercoPop

One of the things I like about is that one can follow hashtags. It might not be a foolproof method but it is a more transparent way than algorithm heuristics to see posts from people you don't follow. The user is still in control!