An independent study by a Stanford University researcher found that dozens of companies are gathering and selling bits and pieces of presumably "anonymous" data on users. Researcher Jonathan Mayer says that 61 percent of 185 sites surveyed shared user information with other sites. And opting out of behavioral targeting doesn't stop the data collection, Mayer says of do-not-track efforts, adding, "It's a fact of life that information is going to leak to third parties."
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