Google, Microsoft, Comcast, AT&T and Verizon are among more than 30 top Web firms and ISPs to receive written queries from the leadership of the U.S. House Energy and Commerce Committee on whether they have targeted ads to users based on their online behavior. "We are interested in the nature and extent to which you engage in such practices, and the impact it could have on consumer privacy," write Energy and Commerce Committee Chairman John Dingell, D-Mich., and ranking Republican Joe Barton of Texas.

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