A Nielsen study shows African-Americans are 30 percent more likely to visit Twitter using mobile devices than the average consumer.
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Firms like CNN, Walmart.com, and Twitter also turned up on the list of 30 "ad focus entities."
Google maintains lead with 65.9 percent of U.S. market share in December 2011, according to comScore.
Marin Software reported 10 percent of search ad clicks in Q4 2011 came from mobile and tablet devices.
Researchers agree the social giant is beating Google for display market share.