My favourite online community. It taught me a lot about what can and cannot work with online social organizations. It is amazing how much can work with so little just through sheer common spirit, focus, and camaraderie.
It was weird how shared content (what we think of as a wiki today) and discussion ("talk" pages on wikipedia) were all mixed together, and it somehow worked. The only Wiki I use these days that still does this is EmacsWiki. Google Wave felt like this in reverse, starting with discussion as default but you could edit everything into a document.
I still think the best I have ever written or contributed was from editing discussions over time into content. Slowly.
I still use those skills. I just edited a Slack Q&A into a checklist on launching partnership integrations. The difference is I don’t write in the “WikiNow” any more because no one understands it except what someone once pejoratively called “wiki monks”. :)