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’ve used Gitit for that. The backing store is Git so all git’s distributed VCS capabilities are there too. If you run Debian, apt install gitit should set it up for you.