Facebook is a social media platform launched in 2004. It allows users to connect with friends, family, and colleagues by sharing photos, updates, and experiences. While Facebook can foster connections, it also presents some risks if users overshare private details. The document discusses both the benefits of staying in touch with others on Facebook, but also some potential downsides like employers checking profiles and identity theft if privacy settings aren't used properly. It emphasizes the importance of being aware that anything posted publicly on social media could impact users in the future.