Which social media platform, founded by Mark Zuckerberg, has the most active users? Facebook is the answer. It began in February 2004 as “TheFacebook,” a social network created by Mark Zuckerberg and fellow Harvard students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes.
Facebook expanded beyond Harvard to other universities, then opened registration to the general public in 2006. Its growth was driven by the News Feed, photo sharing, Groups, Pages, and the ability to connect across countries. Meta reported about 3.07 billion monthly active Facebook users at the end of 2023, placing it above the other options in the question by the commonly used global monthly-user measure.
A common mix-up is Instagram: Meta owns both platforms, and Instagram has grown rapidly, especially among younger users. However, Instagram’s user count is reported separately, while Meta’s “Family” figures combine several services. “Most active users” can also mean daily rather than monthly users, so a date and measurement should ideally be specified; in standard worldwide platform rankings, Facebook remains the canonical answer.