The Wall Street Journal spoke to some spooked ad execs about Google's new metrics offering. "For an advertiser, the last thing you want to do is to have your adviser be the same person you are spending your money with," says Sarah Fay, chief executive of Aegis North America, the media-buying giant owned by Aegis Group of the U.K. Billions of marketing dollars a year trade hands based at least in part on Web-audience …
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