I've been doing my bit to contribute to the JoinFediverse wiki. For example, I made the following pages:
https://joinfediverse.wiki/Watch_party
https://joinfediverse.wiki/List_of_fediverse_watch_parties
https://joinfediverse.wiki/NeoDB
It's a little hard to sign up now, though, because thousands of bots started spamming it with Grokipedia content (that has been cleaned up now).
If anyone would like to contribute, you can message @JoinFediverseWiki with a request for an account, so they know you're an actual human being 