Mark Zuckerberg is known as a technological whiz kid. He created Facebook in 2004 at the age of 20 and became the CEO. The young CEO has gained large criticism for privacy issues with the website, including the collection of user data. However, under his leadership the social networking site has become so ubiquitous that that 1 billion people recently used it in a single day. In 2015, he had an employee approval rating of 95 percent.

Eric Risberg/AP/File
Mark Zuckerberg talks about the Messenger app during the Facebook F8 Developer Conference in San Francisco. For the first time, a billion people used Facebook in a single day on Monday, Aug. 24, 2015.