Facebook started as a student directory at Harvard but quickly grew to connect millions of users. It became the dominant social media platform through network effects as more users joined. Facebook makes money primarily through advertising. It also enables apps and games through the Facebook Platform. Businesses can create Facebook Pages to interact with customers. Facebook for Websites allows users to login to other sites with Facebook credentials, benefiting both sites and Facebook. Going forward, Facebook should continue monetizing the Facebook for Websites platform which provides valuable user data and is undermonetized.