Many major social networking sites are leaking information that allows third party advertising and tracking companies to associate the Web browsing habits of users with a specific person, researchers warn.
That's the conclusion of a study on the leakage of personally identifiable information on social networks done at AT&T Labs and the Worcester Polytechnic Institute.

The findings (PDF document) , which appears to have received scant public attention so far, was presented by the study's two researchers at a conference in Barcelona more than a month ago. Earlier this week, civil liberties group Electronic Frontier Foundation (EFF) referred to the study in a blog post.

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