@manton One quick thought, and I'm not even sure how this would get implemented, but it would be nice to be able to set the "privacy level" of ActivityPub posts. I don't mean for there to be private posts per se (I know public posting on micro.blog is by design) but on Mastodon you can set different levels of just how public you want stuff to be and I think it'd be nice to be able to set that for my posts going over that direction. So for example I always prefered to have my posts be "unlisted." It's not private per se, but they aren't going to show up in global timelines, but they're still there for anyone to see if they want (and if they follow me).
In my mind it's sort of like using a robots.txt file to tell search engines how you want your stuff to be indexed.
Of course I know almost nothing about how ActivityPub works so I'm not sure how you send those flags, and how they get respected (or not) on the other end but it would be nice to be able to set how I want my posts to be sent via ActivityPub. I'm not really suggesting a set of options for each post individually, though I wouldnt' be opposed to that either, but just a default option would be great.