There are heaps! Personally I feel Mastodon is the only one that could be considered in any way mature, but it’s just not something I can get into.

Lemmy has been great with all these new users (not so great prior), but it’s still pretty janky if we’re being honest.

I quite like Bookwyrm as well (a sort of fediverse Goodreads), and use it for tracking what I’m reading. But the federation of reviews doesn’t work quite how I (or they) would prefer. Plenty of content on the flagship instance bookwyrm.social, though I’m not sure how well it works trying to connect from other services. I just have a bookwyrm-specific account for that, though in theory you could use your lemmy account to connect I guess.

There’s also a facebook-like one called Friendica, but honesty until you can upload videos seamlessly I just can’t see it being used by the general public. You basically have to upload videos to youtube (or peertube) and link them. Because of a lack of users, most fediverse sites seem to assume posts will be public. I just can’t see friendica being adopted mainstream until I can upload videos of my kids for family to see without having to put them another site for the world to see.