On January 3, 2017, Mark Zuckerberg posted a status update to his Facebook page. “Every year I take on a personal challenge to learn new things and grow outside of my work,” the Facebook CEO wrote to his 84 million followers. “In recent years, I've run 365 miles, built a simple AI for my home, read 25 books and learned Mandarin. My personal challenge for 2017 is to have visited and met people in every state in the US by the end of the year.

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