The SAI 50+: World's Most Valuable Internet StartupsFacebook tops our list again, with a valuation of $6.5 billion. Facebook has grown at a tremendous clip this year, but digital media multiples have come down so Facebook’s value has stayed the same. Rounding out the top five: Wikipedia, which we think could be worth $5 billion if it tried to make money; Betfair, the online gambling site; NewEgg, the e-commerce site that recently filed to go publi
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