Mark Elliot Zuckerberg (born May 14, 1984) is an American internet entrepreneur and philanthropist is known as the co-founder and leader of Facebook Inc. and its social networking site of the same name as President, Chief Executive Officer, and majority shareholder. He is also a co-founder and board member of the Breakthrough Starshot solar sail spacecraft project. Facebook, Instagram, and WhatsApp are the top social media platforms by Zukerberg.

On February 4, 2004, Zuckerberg launched Facebook in his Harvard dorm. An earlier inspiration for Facebook may have come from the Phillips Exeter Academy, a prep school that Zuckerberg graduated from in 2002. She published her student directory, "Address Book of Photos", which students called Facebook. These photo catalogs were an important part of students' social experiences in many private schools. With their help, students can list attributes such as school year, friends and phone numbers. Once in college, Zuckerberg's Facebook started as a simple "Harvard thing", until Zuckerberg decided to distribute it to other schools, seeking help from roommate Dustin Moskowitz. They started with Columbia, New York, Stanford, Dartmouth, Cornell, University of Pennsylvania, Brown, and Yale University. Samayr Lane, the triple jumper who represents Haiti at the 2012 Summer Olympics, lived in the same room as Zuckerberg when Facebook was founded.

He launched Facebook from his dorm with university roommates Eduardo Saverin, Andrew McCollum, Dustin Moskowitz, and Chris Hughes. Originally launched to select campuses, the site quickly developed and eventually surpassed the university to reach 1 billion users by 2012. Zuckerberg made the company public in May 2012 with a majority stake. His net worth is estimated at $ 74 billion in December 2019, compared to last year with Facebook stocks in general. In 2007, at the age of 23, he became the youngest billionaire to make his world. In 2019, he is the only under 50-year-old on the Forbes' richest ten people list and the only under-40-year-old on the top 20 billionaires list.

Since 2010, Time magazine has named Zuckerberg one of the 100 wealthiest and most influential people in the world for the Man of the Year award. In December 2016, Zuckerberg took 10th place on the Forbes list of the most influential people in the world.