IDC: Google knocks off Yahoo as US display ad leader

Google is successfully convincing its core small and medium search advertisers to also spend on display ads By Juan Carlos Perez, IDG News Service May 26, 2011 12:40 PM ET Yahoo, the perennial leader in U.S. display advertising, has lost its number-one spot in that market segment to arch-rival Google, according to an IDC report released on …

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