CAMBRIDGE, MA - MAY 25:  Facebook Founder and CEO Mark Zuckerberg delivers the commencement address at the Alumni Exercises at Harvard's 366th commencement exercises on May 25, 2017 in Cambridge, Massachusetts. Zuckerberg studied computer science at Harvard before leaving to move Facebook to Paolo Alto, CA. He returned to the campus this week to his former dorm room and live streamed his visit.  (Photo by Paul Marotta/Getty Images)

Facebook

Other than Warren Buffett and Bill Gates, Mark Zuckerberg is probably the most recognizable American business mogul. The 32-year-old multi-billionaire is famously powerful because his social media platform has over a billion users. It wasn't the first such platform but it's the biggest and it has become a powerful tool for publishers, influencers, and even politicians.