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Internet ad revenue reached $31 billion in 2011, up 22...

Internet ad revenue reached $31 billion in 2011, up 22 percent from 2010, the Interactive Advertising Bureau said. Revenue in Q4 2011 was the “best-ever” at $9 billion, a 20 percent increase over the same period in 2010, IAB said.…

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Mobile saw the fastest growth hitting $1.6 billion in 2011, up from $600 million the previous year. Digital video recorded a 29 percent increase to reach $1.8 billion last year. Search revenue totaled $14.8 billion in 2011, an increase of 27 percent over 2010, IAB said.