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How will the former CEO of Ticketmaster help Twitter? - 

Twitter has hired the former CEO of Ticketmaster. What can the head of a ticketing behemoth offer a social media company that's yet to go public? In a word -- commerce. Ticketmaster's Nathan Hubbard helped his old employer dominate online. So his new job could be to help Twitter turn a big user base into some dollar bills. Marketplace Tech reporter Queena Kim has the latest on the story.