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(CNN) -- Seth Priebatsch was at a burrito joint in Boston recently when a message popped up on his smartphone from an app called SCVNGR. If he opened the foil on the burrito ever so carefully and turned the wrapper into a piece of origami art -- and if he uploaded a picture of his creation to the app, the note said, then he would earn points toward a free burrito. Priebatsch thought: That might be fun. "I made a really weak origami crane, because I'm no origami artist myself," he said, but "it got me closer to unlocking a free burrito, which was cool." SCVNGR, which Priebatsch helped create, is one of the latest apps to build on top of the idea of a "check-in," that emerging term some tech-savvy people use to describe the act of using a GPS-enabled smartphone to share their whereabouts with friends. Increasingly, app developers Read More