Facebook
www.facebook.com

Users: 18 million
Ages: 14 – 25
 
Facebook began in 2004 as a social networking site for college students. According to media reports, 85% of college students have a Facebook account. In 2005, Facebook became available to high school students, as well as to college students. Today, similar to MySpace,  Facebook is open to anyone with a valid e-mail address. Facebook members use the site for networking, sharing pictures, dating, and sending messages to their "friends". Over 6 million photos are uploaded to Facebook each day.