Popular social networking sites, including MySpace and Youtube, are changing the human fabric of the Internet. MySpace, with 70 million visitors, has become the digital equivalent of hanging out at the mall for today's teens, who load the site with photos, news about music groups and detailed profiles of their likes and dislikes. Other social network sites include Facebook, geared to college students, LinkedIn, aimed at professionals, and Xanga, a blog-based community site. In all, an estimated 300 sites, including smaller ones such as StudyBreakers for high schoolers and Photobucket, a site for posting images, make up the social network universe.

YouTube is a popular video sharing website where users can upload, view and share video clips. YouTube was created in mid February 2005 by three former PayPal employees. The San Bruno-based service uses Adobe Flash technology to display a wide variety of video content, including movie clips, TV clips and music videos, as well as amateur content such as videoblogging and short original videos.