I keep feeling frustrated as valuable knowledge for my different hobbies over the last years became siloed away in corporate social media. I believe wikis could be a way out, but can we have decentralized, federated wiki software that can kind of talk among each other?
I'm not sure federation is that important on sites that aren't built around socializing. I think it is sufficient for a wiki to provide a good export mechanism so that it can be archived or mirrored by others.
I could see a setup where each server is a separate wiki around a specific topic, and federation allows people from other servers to edit or comment/discuss. Pretty much like Fandom but federated. It would be beneficial in that people wouldn't have to make a login for every wiki they follow, and may help discoverability.
This is what I mean. Lots of small wikis, like subreddits, like the old forums, only that a wiki setup seem to me a better way to collect and present knowledge than the forums, mailing lists, facebook groups, subreddits or wherever we used to put our stuff.