U.S. mobile ad spending is likely to grow 81% this year, easing to 61% in 2014 and 53% in 2015, according to an estimate by Publicis-owned ad agency ZenithOptimedia. That growth rate will outpace overall Internet ad spend, which is expected to rise 16% a year to account for 27.8% of all U.S. ad spend in 2015.

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