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Mark Zuckerberg
Mark Zuckerberg is having a good month. Last week Facebook accounted for 7 percent of U.S. Internet traffic, according to Hitwise, overtaking Google as America’s most popular website. And the Palo Altan returned to Fortune’s list as the world’s youngest billionaire (“Hey Mom, guess what?”), and a self-made one at that, edging out German Prince Albert von Thurn und Taxis for the honor. If Facebook were a country it would be the world’s fourth largest. We expect to hear a lot more from King Mark and Facebook nation.