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The Twitter Inc. logo is displayed on the facade of the company's headquarters in San Francisco, California, U.S., on Thursday, Nov. 7, 2013. Twitter Inc. surged 85 percent in its trading debut, as investors paid a premium for its promises of fast growth. Photographer: David Paul Morris/Bloomberg via Getty Images

The Twitter Inc. logo is displayed on the facade of the company's headquarters in San Francisco, California, U.S., on Thursday, Nov. 7, 2013. Twitter Inc. surged 85 percent in its trading debut, as investors paid a premium for its promises of fast growth. Photographer: David Paul Morris/Bloomberg via Getty Images