Marketers Can Glean Private Data on Facebook

Online advertising offers marketers the chance to aim ads at very specific groups of people — say, golf players in Illinois who make more than $150,000 a year and vacation in Hawaii.But two recent academic papers show some potential pitfalls of such precise tailoring.Both papers focus on Facebook ads and show that in certain circumstances, advertisers — or snoops posing as advertisers — may be able to learn sensitive profile information, like a person’s sexual orientation or religion, even if the person is sharing that information only with a small circle of friends. Facebook does not share such information with advertisers.
http://www.nytimes.com/2010/10/23/technology/23facebook.html

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