Facebook Building Lead in U.S. Display Ads, ComScore Says
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Facebook Inc., the world’s largest social-networking service, accounted for 28 percent of U.S. online display-advertising impressions in 2011, expanding its lead in the industry, ComScore Inc. said.
Facebook had 21 percent of impressions -- the number of times an ad is presented for viewing -- in the previous year, ComScore said. Yahoo! Inc. remained No. 2, with 11 percent, the research firm found. Microsoft Corp. was third, accounting for