Drew Houston, chief executive officer and co-founder of Dropbox Inc., smiles during a presentation at the TechCrunch Disrupt SF 2013 conference in San Francisco, California, U.S., on Monday, Sept. 9, 2013. TechCrunch, which runs from Sept. 9-11, features leaders from various technology fields and includes a competition for the best new startup company. Photographer: David Paul Morris/Bloomberg via Getty Images
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