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U.S. lawmakers have broadened their investigation of Internet advertising, asking nation's largest telecommunications and Internet companies whether they target ads based on consumers' Web surfing habits. Companies receiving the letter include Google, Yahoo, Microsoft, AT&T, Verizon, Qwest and AOL among others.

According to Joelle Tessler of the Associated Press, the "letters seek details on how many consumers have been tracked, whether those people have been notified and whether they were given the option to 'opt out' of it. The committee also wants to know how the collected information is used and how it is gathered—for example, whether the companies aggregate data from different online applications."

Read full story: Associated Press

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