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Snapchat is a mobile app that allows users to send each other images and videos that automatically disappear after a few seconds. The service is particularly popular among teens, who often use it to send racy pics to friends and admirers. Several third-party apps have emerged that allow users to save the Snapchat images they receive. This summer, an unrelated hack of Apple iCloud accounts resulted in the posting online of nude photos of actress Jennifer Lawrence and other celebrities.