A couple of months ago someone asked me to set up wikis about busking and abou veganism. A wiki about veganish things had been on my mind for a while. I just didn't directly want to register another domain name. I started looking around and found wiki.yt was still free. So I started vegan.wiki.yt, a website with information for vegans and wannabegans. It's growing fast and we already have more than 100 articles.
Then I also turned wiki.yt and all the other wikis I'm running into a wikifarm. Thinking about some other wikis to set up, if there's enough interest I'll be happy to set up a wiki about interesting topics. Meanwhile I already started wiki about bicycles, since I figured there'd be enough people happy to edit (and read) about bikes.
Oh and meanwhile I also managed to upgrade my first and most successful Drupal website to Drupal 7.