Evan Spiegel dropped out of Stanford University in 2012, three classes shy of graduation, to move back to his fathers house and work on Snapchat. Spiegels fast-growing mobile app lets users send photos, videos and messages that disappear a few seconds after they are received. Founded in 2011, Snapchat is especially popular with teenagers and young adults, but many parents fear the app is the ideal tool for sharing lewd photos, or sexting.