User blog comment:Red Monstersmasher/My happiness being on these wikis/@comment-4403798-20111012215148/@comment-1393830-20111012215507

It is Wikia's terms of use, something that they require in order to meet the demands of COPPA, the Children's Online Privacy Protection act which disallows children under 13 from giving any personal information on the internet. If Wikia were to allow you to have an account, they would be violating U.S law and could face large fines and continued non enforcement of the law could lead to Wikia being shut down.