AT&T, Google Among The Biggest Online Advertisers — comScore

As part of its 2012 US Digital Future in Focus whitepaper, comScore looked at the online ad landscape and found a mix of old and new names. The report includes a list of the top 10 display advertisers in the United States (all of this data is US-only), as measured by impressions. As in previous years, AT&T topped the list, but there's a newcomer — Google, which delivered 40.4 billion ads for products like Chrome, Google Offers, and Google+. Large brand advertising on the Internet is growing in general, comScore says. To quantify that, it measured the number of advertisers delivering at least 1 billion impressions per quarter. There were 145 advertisers in that league during the final quarter of 2011, up 38 percent from the same period in 2010.

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