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Things to know about Mark Zuckerberg

Photos Logo Photos | Slide 2 of 27: CAMBRIDGE - NOVEMBER 12: Founder of Mark Zuckerberg, right, and Dustin Moscovitz, co-founder, left; have their photo taken at Harvard Yard. The two are students at Harvard University who are taking the semester off. (Photo by Justine Hunt/The Boston Globe via Getty Images)

He created a messaging software called ZuckNet when he was just 12. It helped all his family members communicate with each other, including his dad who ran a dental business from home.

(Pictured) Zuckerberg and Facebook co-founder Dustin Moskovitz at Harvard University in 2004.

© Paul Sakuma/AP Photo
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