There is an episode of BBS The Documentary from @textfiles that is about FidoNet, which was... almost, kind of, like an early federated forum thing (basically it let people on BBS server 1 could talk to people on BBS server 2). The tech details don't line up exactly but I was struck watching it a few years ago at how the social dynamics of admins of different BBSes mapped pretty perfectly onto fediverse admins.
Anyway if you want to feel like time is a flat circle: https://www.youtube.com/watch?v=Ng0NE4lDP2U
Also struck by the description text for that video, which says FidoNet "may have been the single-largest 100% amateur organized and run computer network of all time". Reminds me a bit of what we've got going on here. Exciting, scary, exhilarating.