(clothes, supplies, and even homework) on eBay and the Internet; exchanging music on P2P sites; building games with modding (modifying) tools; setting up meetings and dates online; posting personal information and creations for others to check out; meeting people through cell phones; building libraries of music and movies; working together in self-formed teams in multiplayer online role-playing games; creating and using online reputation systems; peer rating of comments; online gaming; screen saver analysis; photoblogging; programming; exploring; and even transgressing and testing social norms.
