An IDC research report released Thursday knocks Yahoo from the No. 1 spot for U.S. display ads. In first-quarter 2011, Google's share of the U.S. display ad market rose to 14.7%, compared to 13.3% in
fourth-quarter 2010. Yahoo's share fell to 12.3% from 13.6%. Citing the study, Juan Carlos Perez tells us online ad spending grew 14.3% worldwide to $18.2 billion in first-quarter 2011. U.S. spending
grew 14.2% to $8.1 billion.
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