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UNITED STATES - SEPTEMBER 14: The website for Mixi Inc., is displayed on a computer monitor in New York, Thursday, September 14, 2006. Shares of Mixi Inc., Japan's largest Internet site for social networking, doubled on the first day of trading, making 30-year-old founder Kenji Kasahara a billionaire. (Photo by Andrew Harrer/Bloomberg via Getty Images)

UNITED STATES - SEPTEMBER 14:  The website for Mixi Inc., is displayed on a computer monitor in New York, Thursday, September 14, 2006. Shares of Mixi Inc., Japan's largest Internet site for social networking, doubled on the first day of trading, making 30-year-old founder Kenji Kasahara a billionaire.  (Photo by Andrew Harrer/Bloomberg via Getty Images)