Facebook launched its development platform yesterday and includes Facebank as a demo of what is possible.
According to Wikipedia, Facebook is a social networking service that is used by 85% of all college students in the United States. It is the 7th largest site in the US and even tops flickr in terms of photo uploads. Rolling Stone even calls Facebook the hottest site on the web.
FaceBank is a virtual tracker of how much money you and your friends owe each other. Its purpose is explained in their 'about page' with a short example of how it works.
More interestingly though, the technical details clearly endorses RIFE as being an excellent framework. They even include the custom authentication system that was written to integrate RIFE's authentication system with the facebook development platform and log users in with their regular facebook credentials.
This is a wonderful public acknowledgment of RIFE's uprise as one of today's Java frameworks of choice.