#16 and 17 Wikis

Yay! Finally something I know about. I did a research paper on Wikipedia as part of my Masters and I was really impressed by the level of accuracy and more importantly currency of the pages. Of course there's always problems with the more controversial pages getting locked out because people cannot agree, and more obscure areas may escape the mass editing that the more popular pages enjoy. However I was really impressed with how quickly spam and obscenities got removed, which meant the system of mass editing was working. Its not britannica, but its much more fun!