The number of U.S. brands serving at least 1 billion impressions per quarter rose to 145 in late 2011, an increase of 38% compared with 2010 figures, according to comScore's annual U.S. Digital Future in Focus report. AT&T remains the country's biggest digital advertiser, serving more than 105 billion impressions in 2011, while Google climbed into the top five after serving up more than 40 billion ad impressions for products such as Chrome and Google+.

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