WPP's Sorrell: Twitter Is Still an Unproven Medium

Nov. 7 (Bloomberg) -- Sir Martin Sorrell, CEO & founder at WPP, explains how WPP works Twitter into its advertising plans for companies and examines Twitter’s ad growth potential. He speaks on Bloomberg Television’s “Bloomberg Surveillance.”

Full Show: Bloomberg Businessweek (05/26)
18:58 - Bloomberg Television takes you behind the scenes of our award-winning magazine "Bloomberg Businessweek." Hosts Carol Massar and Oliver Renick talk with the writers who break news on a weekly basis. (Source: Bloomberg)
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