A look back at the biggest tech hits and misses in recent years.
Facebook | HIT Facebook.com worker Ginnie Chan, left, works at Facebook headquarters on Feb. 5, 2007, in Palo Alto, Calif. The social-networking site launched in February 2004 exclusively to Harvard University. The site would later expand to 800 college networks and eventually open registration to everyone in September 2006. The site now boasts more than 750 million active users and counting. Paul Sakuma/AP