Catherine Cook attends a tech conference in San Francisco, Calif. on Friday July 13, 2007. Cook launched the MyYearbook website as a 16-year-old high school student and now, one year later, it has become the third most popular social networrking site behi

Catherine Cook attends a tech conference in San Francisco, Calif. on Friday July 13, 2007. Cook launched the MyYearbook website as a 16-year-old high school student and now, one year later, it has become the third most popular social networrking site behind MySpace and Facebook. PAUL CHINN/The Chronicle **Catherine Cook (Photo By Paul Chinn/The San Francisco Chronicle via Getty Images)