Also Mbin mentioned in other comments for both Reddit and Twitter-inspired experiences
Also maybe worth noting there's some degree of interoperability between instances? Like Misskey often displaying full text bodies from posts from threads-types of sites, Mastodon running Peertube videos as attached videos, and Mbin, Misskey and Mastodon users being able to follow users on pretty much any instances, and Lemmy and Mbin (and probably Piefed though still to confirm) being able to follow Peertube channels as communities.
mbirth@lemmy.ml 1 week ago
As Plume isn’t maintained anymore, there are also a few ActivityPub plugins for WordPress which work very well.