The document discusses how Facebook uses default privacy settings and prompts to encourage broad sharing of user information. It notes that initially Facebook took a network-centric approach to privacy, but introduced options for users to control visibility. However, the defaults always favored broad sharing. Platform Beacon in 2007 allowed sharing of user actions with external websites. While this was discontinued, it led to privacy setting prompts on login to encourage reconsidering settings. More users adjust settings when prompted and informed of the changes.