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Internet ad revenue hits record $31B in US in 2011
Revenue from Internet advertising in the U.S. hit a record $31 billion last year, according to a study released Wednesday.That's up 22 percent from $26 billion in 2010, the previous record.The Interactive Advertising Bureau, an industry group, conducted the quarterly study with PricewaterhouseCoopers.About half of the ad revenue, $14.8 billion, came from the search category. Those are the text-based