Mark Zuckerberg drops new explanation of why he was so slathered in sunscreen

Mark Zuckerberg applies sunscreen as he attends Sun Valley

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Mark Zuckerberg's sunscreen-slathered face while surfing ignites

Mark Zuckerberg Explains Excessive Sunscreen Photo

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Mark Zuckerberg spars on a floating barge with MMA fighters in a

Mark Zuckerberg skips the caked-on sunscreen in Hawaii

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Question: Did Facebook founder and CEO Mark Zuckerberg single