Facebook was founded in 2004 by Mark Zuckerberg while he was a student at Harvard University. Originally called "The Facebook", it launched for Harvard students and grew rapidly. By 2005 it had expanded beyond Harvard and was renamed Facebook. Over time, Facebook added new features like Messenger and Marketplace and acquired companies like Instagram and WhatsApp to grow globally. These developments increased Facebook's revenue, workforce, and company value significantly from its early days as a student social network.