I'm thinking currently that the problem with social media is the comments / replies (assuming the DM thing can be closed properly as is the case with most social media nowadays). It's there that random people (and bots, spam accounts, trolls) have access to your experience of your conversations. This is what you see inorganic accounts targeting.
Usually it's like this. You see someone making an interesting point. It indicates there are many replies. You click to see whether people have additional information / points to make, only to find loads of tangentially related posts that accounts likely insert below anything that has matching keywords. Or all these 'have you also seen this link' things that are not at all aimed at the OP but at their audience.
Not having visible comments at all (old Tumblr) or being able to close comments (Instagram) or limit them to specific sets of people (Twitter) may not be a complete solution. Somehow you should be able to start an open conversation and not allow others to hijack it.
I'm now thinking of something like this: someone posts an OP / Top Level Post and becomes the owner of that conversation. Anybody can reply, but that only goes to the original poster. That original poster has different inboxes for DMs, replies from followed people, replies from followers, replies from approved persons, replies from all, etc. They probably get a notification for 'replies from followed people', but only look at the others like 'replies from all' when they feel up to it. I'm thinking of different inboxes for each Top Level Post, which you can also close after a while.
When the conversation owner sees a reply, they can click whether they consider the reply relevant or useful for public viewing. Only then the reply becomes visible under the conversation for anybody opening it. Obviously, if a conversation gets old, heated or boring, OP will just not look at replies for that conversation again. If someone tends to receive harassment online, these are hidden in the 'replies from all' inboxes that you don't need to look at.
So each Top Level Post essentially is a forum with its poster as moderator. But a lazy moderator, with no peer pressure to judge all that comes in, it's your own space after all. And no forum rules to reject posts, only to maybe accept a post that you feel adds to the conversation.
I'm not seeing how this would be compatible with Activitypub, though...
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