A data breach has exposed the usernames and partial phone numbers of 4.6 million users of Snapchat, a popular photo- and video-sharing app. The breach was accomplished by exploiting a flaw that was previously brought to company's attention by security researchers. Last year, EPIC filed a complaint with the Federal Trade Commission regarding Snapchat's deceptive claim that photos would "disappear forever" after a set period of time. The Federal Trade Commission has thus far failed to take action on the EPIC complaint. For more information, see EPIC: Federal Trade Commission.