Two senior U.S. lawmakers say they're "troubled" by the collection of personal data at many websites, and they want details on how much data 15 popular sites collect and what the sites do with the data.
Representatives Ed Markey, a Massachusetts Democrat, and Joe Barton, a Texas Republican, sent a letter Thursday to 15 sites, including ones operated by Microsoft, Yahoo and Comcast. The two lawmakers, both senior members of the House Energy and Commerce Committee, said in the letter that they were concerned about the data privacy practices outlined in a recent Wall Street Journal series.

The Journal series suggests that "spying on Internet users" is one of the fastest-growing businesses online.

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