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Mobile grew the most of all categories -- 149% -- but still represents a puny share of the overall market -- $1.6 billion -- according to the report issued on Wednesday. Digital video also rose 29% to $1.8 billion, search was up about 27% to $11.7 billion and display advertising jumped 15% to $11.1 billion, or 35% of all revenues. Search is still the largest category with 47% share.
"This historic moment, with an especially impressive achievement in mobile, is indicative of an increased awareness from advertisers that they need to reach consumers where they are spending their time -- in digital media,” said Randall Rothenberg, president and CEO, of the IAB, in a press release.
In terms of spending, retail continued to be the top category, accounting for 22% of all Internet ad spending. Next on the list was telecom (12%) and leisure/travel (8%). Meanwhile, Internet advertising is the second-biggest ad category next to television, which accounted for $38.5 billion of ad spending on 2011.
A full copy of the IAB report can be found here.