Much has been made of the rumored Facebook Phone.... specifically around the hardware component (see the Techmeme stream here). Regardless of whether or not a Facebook branded device will soon exist, the Facebook Phone already exists as an OS of sorts.... comprised of core applications. Here is my iPhone's homescreen. There is a folder dedicated to Facebook with the core Facebook Application, Facebook Messages, Facebook Camera, and Facebook Pages. It is not hard to imagine standalone apps for contacts, calendar, places, etc. Said differently, if you think about the phone's core applications, Facebook can replicate many of them:- Contacts :: FB Graph - Calendar :: FB Events - SMS :: FB Messages - Email :: FB Messages or blown out email product - Maps :: FB Places - Camera :: FB Camera - Media :: Open Graph / Facebook App Platform?