The internet no longer exists, and replace by separate unmoderated chat-rooms for each city/town/village; What does your chatroom look like? What do you think other chatrooms will look like?
To re-iterate, every place gets their own separate room. You must be physically in a place to join their chatroom.
Maybe like 4chan. No usernames, just a big mix, to make surveillance more difficult. There might be some ephemeral tracking (data retained no more than 5 minutes) to separate the participants in threaded conversations and to throttle stuff like spam floods. With luck the locality requirement would be enough to stop it turning from a 4chan-like cesspit. I didn't know about imageboard systems when they were happening and before they became awful, but they sound in retrospect like they were cool as hell, better than what we have now.