Social networking Web sites such as MySpace and Facebook, where millions of minors post personal interests and contact information, are fertile hunting ground for child predators. Recently MySpace, the largest social networking site, owned by media giant News Corp., revealed that thousands of known predators were registered with the service. Several state attorneys general demanded names, citing many cases in which predators had exploited minors contacted through MySpace. The company turned over more than 7,000 names and closed those accounts.