Pragmatic editor Susannah Pflazer interviews Mike Mangino, author of "Developing Facebook Platform Applications with Rails." Mike describes how Facebook works, and talks about using facebooker for Ruby on Rails to provide helpers, handle authentication, and more.Mike walks through developing an application in Facebook, describes the parts of Facebook, as well as messaging, testing, and engaging users. Find out about the magic 8-second rule and the key aspects of a successful Facebook application.