Mark Zuckerberg, born May 14, 1984, is an American computer programmer and internet entrepreneur, best known as a co-founder of Facebook. By April 2013, he was the chairman and CEO of Facebook, with a personal wealth estimated at $13.3 billion, and Facebook reached one billion users in 2012. He became a billionaire at the age of 23 and has been recognized as one of the most influential people globally, featured in various legal disputes regarding the company's founding.