Online privacy might be the biggest oxymoron of the early 21st century. Computer users are so ready to share the most innocuous details about their lives on social networks, for example, that it seems privacy has willingly been surrendered.
Information security researchers, privacy experts and hackers alike, in the meantime, have become adept at foraging for nuggets of personal data to exploit this phenomenon. Perhaps no individuals have been more at the forefront of this movement than Carnegie Mellon University professors Alessandro Acquisti and Ralph Gross. Two years ago at the Black Hat Briefings in Las Vegas, the two researchers proved what had long been a theory that individuals

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