At $22.66 billion for 2009, Internet advertising revenue was down 3.4% from the previous year. But fourth-quarter online ad revenue for 2009 was up 2.6% from that of the fourth quarter of 2008, to $6.26 billion, according to the Interactive Advertising Bureau (IAB) Internet Advertising Revenue Report, conducted by PricewaterhouseCoopers.
Search accounted for nearly half (47%) of the online ad revenue for both the fourth quarter and the full year. It has been the largest revenue-generating format since 2004. Display advertising
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