Facebook success because well planned attempt to preserve the user experience, and the best service to users was enough to make the decision to negotiate with the 3rd party to come and create something new to Facebook.
Facebook successful because planning carefully to preserve the user experience to more and better services to users, but enough to have the power to negotiate with 3rd party to develop and create new things. With Facebook
Facebook succeed because planning well, trying to keep the user experience more and good service to users much enough to leverage. 3rd party to develop and create new things to Facebook.