I have a mastodon and while its not activitupub i use matrix. Forgot to mention my pixelfed lol
- tenforward.social is a good general instance with wide reach and strong moderation in balance
- weirder.earth is much cozier because of its extensive blocklist and community cohesion
- one instance is for my family
- one instance is for porn and NSFW posting in general
- on instance is for a specific kind of fiction