Jack Dorsey, co-founder and chairman of Twitter Inc. and co-founder and chief executive officer of Square Inc., speaks during an interview at Just Baked Cupcakes in Detroit, Michigan, U.S., on Tuesday, Sept. 17, 2013. Twitter Inc., which announced plans last week for an initial public offering, is still deciding whether to list on the New York Stock Exchange or Nasdaq Stock Market, setting off a horse race for the high-profile deal. Photographer: Jeff Kowalsky/Bloomberg via Getty Images
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