User blog comment:Semanticdrifter/Updates to COPPA/@comment-7294592-20130702140155/@comment-4811793-20130702150835

It applies to any website that is directed to children in the U.S. Specific compliance strategies are up to the individual sites. The nature of Mediawiki has presented some special challenges for Wikia, and you probably won't see the same exact restrictions everywhere. Most non-wiki sites will likely rely on their age gate mechanism, but they probably didn't allow anonymous contributions already.