Snapchat

In this Thursday, Oct. 24, 2013, Snapchat CEO Evan Spiegel poses for photos, in Los Angeles. Spiegel dropped out of Stanford University in 2012, three classes shy of graduation, to move back to his father's house and work on Snapchat. Spiegel’s fast-growing mobile app lets users send photos, videos and messages that disappear a few seconds after they are received (AP Photo/Jae C. Hong)Photograph by Jae C. Hong — AP