Online advertising in the US topped $26 billion last year.

IAB: 2010 Online Advertising Worth $26 Billion in the US. UK markets follow.

The IAB released its yearly figures for 2010 online advertising report this morning. Search marketing constituted the largest category share of the $26 billion online ad spend, at 46 percent.

This year also marks the first time that the IAB and its partner PriceWaterhouseCoopers are estimating mobile ad revenues. They put US mobile ad revenues at between $550–$650 million in 2010.

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