U.S. online advertising spending hit a record $31.74 billion in 2011, according to research from the IAB and PricewaterhouseCoopers. The burgeoning mobile advertising category contributed $1.6 billion to the total -- a spike of 149%. Search revenue totaled $14.8 billion, while display hit $11.1 billion. Get the full report, detailing spending by media category and by industry.

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