COPPA & Wikia
If you directly state on your userpage that you are 12 or younger, you may be reported to Wikia, who will take the matter into their own hands. Please note that you are not permitted to ask other users their age. If you state that you are younger than 13 in chat, we reserve the right to ban you from chat - Wikia will not accept evidence from Chat such as print screens or logs.
Taken from Wikipedia, and Wikia: see http://community.wikia.com/wiki/User_blog:Semanticdrifter/Updates_to_COPPA