A user checks a Twitter feed on a smartphone in this arranged photograph taken in London, U.K., on Friday, Oct. 4, 2013. Twitter Inc.’s initial public offering documents suggested a valuation of $12.8 billion for the microblogging service, underscoring the seven-year rise of a still unprofitable company that has helped revolutionize how people share information. Photographer: Chris Ratcliffe/Bloomberg via Getty Images

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