Facebook is a social media platform that allows users to create profiles, connect with others, and share information. The document provides tips for marketers to engage audiences on Facebook, such as keeping posts updated with links and pictures, suggesting the page to friends, and using tools like Facebook Insights, Buffer, and Hootsuite to measure engagement. Marketers are also encouraged to celebrate milestones, make fans feel important through direct messages, publish creative posts, and set up interactive groups.