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.”

Is the U.S. Economy Stuck in Growth Purgatory?
41:14 - Michael Arone, State Street Global Advisors chief investment strategist, discusses U.S. GDP growth with Bloomberg's David Gura and Vonnie Quinn on "Bloomberg Markets." (Source: Bloomberg)
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