Re: your edit - I've always thought it'd make for a fun pet project to take the hyper-engagement-driven approach that social media apps take but apply it to Wikipedia. Like a Tiktok-style vertical feed of articles that tries to find the ones you'll engage with most (WikiScroll [0] is already part of the way there). Or a chatroom corresponding to each article that people can banter in, kind of like you described. Or a DM feature but you can only send Wikipedia links. The idea of Wikipedia as a social catalyst is super interesting to me.

[0]: https://wikiscroll.blankenship.io/