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Mark Elliot Zuckerberg (/ˈzʌkərbɜːrɡ/; born May 14, 1984) is an American technology entrepreneur and philanthropist. Zuckerberg is known for co-founding and leading Facebook as its chairman and chief executive officer.[3][4] He also co-founded and is a board member of the solar sail spacecraft development project Breakthrough Starshot.[5]