Facebook is a social networking app that allows users to connect with others and share updates about their lives. With over 4 billion likes per day and 289 million monthly active users, Facebook has become the largest social media platform worldwide since its founding in 2004 by Mark Zuckerberg for Harvard students. Facebook owns other popular social media apps like WhatsApp, Messenger, and Instagram, and surpassed 1 billion users in 2012, establishing itself as the first social network to reach that milestone.