@evan There's also the Diaspora platform (which uses diaspora protocol, not ActivityPub). Diaspora is older than ActivityPub and older than Mastodon.

I actually prefer Diaspora over all of the ActivityPub platforms, and it's my main social media hangout really. I prefer the rigid posts/boosts and comment thread paradigm, which allows people to moderate comments.

Also, the diaspora protocol is simpler and less flexible than AP, making it robust against Embrace Extend Extinguish...