The first social media platform to reach one billion active users was Facebook. Founded by Mark Zuckerberg and a group of college roommates in 2004, Facebook grew rapidly, allowing users to connect, share content, and communicate online. The platform's success can be attributed to its user-friendly interface and continuous innovation, introducing features such as the News Feed, Messenger, and various multimedia sharing options. By reaching one billion users in 2012, Facebook set a significant milestone in the social media landscape, influencing the development of other platforms as well.