If your kids are not on facebook, where are they? Try Snapchat. There�s no need to burn after reading: This app�s files self-destruct. The service is designed for savvy teenagers who don�t want to leave an Internet footprint. Released in September 2011, users can send �Snaps� � photos or videos � that last between 1 and 10 seconds, depending on the limit set by the sender.