European regulators have laid out operating guidelines for Facebook, MySpace and other social-networking Web sites to ensure they comply with the region's privacy laws, in a move to address concerns about the handling of users' personal information. Regulators here say social-network users are protected by the 27-nation EU's strict privacy laws, which require Web sites to warn users of privacy risks and limit the sites' ability to target advertising based on members' race, religion or other sensitive categories.