I’m very active on Wikidata, the knowledge base that anyone can edit.
Of all Wikimedia projects, Wikidata is probably my favorite. I have always loved data modelling. And since my first job involving online archives in the early 2000s, I have seen the need for an open, shared and public repository of structured human knowledge. Wikidata may become the long-overdue knowledge base that ‘connects it all’.
Many things are great about it. One of those: the fact that it allows you to describe human society in all its complexities. Another: it has a wonderful, constructive and pleasant volunteer community.
My user page on Wikidata: https://www.wikidata.org/wiki/User:Spinster