AT&T buying company that delivers targeted ads based on your Web browsing

Enlarge / The AT&T logo is displayed at a retail store in Washington, DC, on Monday, March 21, 2011. (credit: Getty Images | Bloomberg)

AT&T is buying an advertising company that delivers personalized ads based on Internet users' Web browsing habits.

AT&T today announced "a definitive agreement to acquire AppNexus," saying that "AT&T is investing to accelerate the growth of its advertising platform and strengthen its leadership in advanced TV advertising."

AT&T's just-completed purchase of Time Warner Inc. will help it gather more information about people's video watching habits, both online and on cable and satellite TV services. AT&T could combine this data with AppNexus in order to deliver more personalized ads based on its customers' TV watching and Web browsing histories.

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