PHOTO: Mark Zuckerberg – Facebook
Gains in 2018: $4.73billion
Facebook founder Mark Zuckerberg added a whopping $22.6 billion to his fortune in 2017, bringing his net worth to $72.6 billion.
Zuckerberg began working on the social networking site in January 2004 when he was studying at Harvard. He famously dropped out of the Ivy League school to focus on creating the website.
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