Total U.S. online display advertising sales rose, but No. 1 social network site Facebook's (FB) grasp on the market slipped last quarter, according to a new report. Overall U.S. online display ad revenue jumped 14% to $2.9 bil, market tracker IDC said. But Facebook's share fell to 12% in Q1 from 13.9% the prior quarter. Google's (GOOG) share rose to 25% from 21.5%, Yahoo (YHOO) rose to 7% from 6.2%, and Microsoft (MSFT) fell to 7.1% from 8.7%. Facebook shares fell 2.7% to 31.36. Google fell 0.9% to 564.31.
Investors were edgy Wednesday ahead of the appearance of U.S. Federal Reserve chairman Ben Bernanke before lawmakers …