Mobile has broken through to reach the mainstream of digital advertising this year, according to U.S. ad spending estimates by eMarketer. This year, U.S. mobile ad spending will be up 79% to reach $743 million, the firm forecasts. That growth will slow somewhat to still-dramatic double-digit rates as spending hits over $1.1 billion in 2011 and more than $2.5 billion by 2014.
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