GameGecko (http://gamegecko.com/)

Parents need to know that some games on this site are violent and feature fighting, blood, and bruising, although the "shooting games" aren't heavily promoted and are on the bottom of the page. The site's IM feature lets users chat with other users in a public IM window or on a one-to-one basis without any restrictions -- and the talk does get pretty racy. The site sometimes sticks moderators in the chats, but in most cases they rely on other users' complaints. Users can -- and do -- say inappropriate things like "Wanna have cybersex with me?" and swearing isn't filtered out. Users can block others from IMing them directly or complain about them by clicking on a "warn" button; although someone has to be warned by multiple visitors before being banned, and it's unclear how many warnings it takes for that to happen.