Nearly one in five Google U.S. ad dollars will come from mobile search this year, according to an eMarketer estimate. That's up nearly 7 percentage points from last year, and it's expected to reach nearly 31% in 2015. By then, mobile search revenue will have surpassed desktop and mobile display advertising and inch toward desktop search. In the meantime, Facebook's mobile ad revenue should surpass online next year, and Twitter should reach a 62% mobile to 38% online split by 2015.
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