Mark Elliot Zuckerberg (born May 14, 1984) is an American businessman and programmer who co-founded the social media service Facebook and its parent company Meta Platforms. He is its chairman, chief executive officer (CEO), and controlling shareholder.

Zuckerberg briefly attended Harvard College, and launched Facebook there in February 2004 with his roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes. Zuckerberg took the company public in May 2012 with majority shares. He became the world's youngest self-made billionaire in 2008 at age 23 and has consistently ranked among the world's wealthiest people. According to Forbes, Zuckerberg's estimated net worth stood at US$258 billion as of September 2026.