phantomfive writes: Researchers were able to track, and use GPS data from the ad network to track a user to their actual location, and trace movements through town. The paper asks: "can third-parties use the purchasing of ads to extract private information about individuals? We find that the answer is yes. For example, in a case study with an archetypal advertising network, we find that — for $1000 USD — we can track the location of individuals who are using apps served by that advertising network."
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