Peertube [0], Lemmy [1], and Pixelfed [2] all run on the same protocol as Mastodon. You can interact across all of them (e.g. Mastodon user replies to Peertube video post), but the presentation on each is very different.
There's more as well. Like Friendica [3] feels a little bit like Facebook, and Hubzilla [4] feels a bit like Google+ used to. Diaspora feels a bit more basic, but similar concept to Friendica.
pixelfed looks nice. Instagram has been the only social I kept around because it's nice to look at pictures but they've recently transitioned to full on Tiktok/yt shorts competitor, I'd love to jump ship to something that's just photographs again.
Never tried lemmy, are the separate servers essentially "subreddits" ? That's cool that there aren't any global admins so each community really can have their own moderation rules.
lol this was not at all obvious to me at first glance from the framing of 'choose a server', but I guess that's the whole value proposition of activitypub is it doesn't matter what server I started on.
There's more as well. Like Friendica [3] feels a little bit like Facebook, and Hubzilla [4] feels a bit like Google+ used to. Diaspora feels a bit more basic, but similar concept to Friendica.
All of them can cross interact.
[0] YouTube style - https://joinpeertube.org/
[1] Reddit-style - https://join-lemmy.org/
[2] Instagram-style - https://pixelfed.org/
[3] https://friendi.ca/
[4] https://hubzilla.org