An anonymous reader writes "'When the first NSA surveillance story broke in June,' writes Dennis Fisher at Threatpost, 'most people likely had never heard the word metadata before. Even some security and privacy experts weren't sure what the term encompassed.' The NSA and its supporters have, of course, emphasized that phone records collection is 'not surveillance.' Researchers at Stanford are now crowdsourcing data to incontrovertibly establish just how much the NSA knows. 'Phone metadata is inherently revealing,' says a study author. 'We want to rigorously prove it—for the public, for Congress, and for the courts.' If you have an Android phone and a Facebook account, you can grab the MetaPhone app on Google Play."