The wildly popular Facebook social networking platform has published an open Application Programming Interface (API) and developers are eating it up--60,000 signed up to use it in the first few days; with this API, any programmer can create applications and new features for Facebook Explores and explains the components available to programmers, including working with Facebook Markup Language (FBML), querying Facebook with FQL, application layout and flow, advanced configuration and performance tuning, and more Businesses such as NBC, Yahoo!, Red Bull, Forbes, and the Washington Post are building branded applications to reach the growing Facebook community