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A couple of researchers at MIT are reporting that some popular smartphone apps are collecting a lot of information about users, even when the apps aren't being used. 

We're talking games like "Angry Birds," which, they  found tracks the phone owner's location. Another app, Bowman, collects information on a user's web-surfing habits. For technical reasons the researchers could only test out apps on Android phones, not iPhones.

But I guess we really DO pay to play. 

Follow Sarah Gardner at @RadioGardner