Well, that's not exactly accurate considering Google developed Android. As far as I'm aware, most people bought Google phones with the assumption that their hardware would better take advantage of their OS and provide a real threat to Apple.
I really don't see any thing other than a gimmick in making a FB phone. Maybe I just don't "get" it. After all, I don't really use FB anyway.
Before anyone says anything about my inclination towards technology, new things, etc. - I'm a systems and network administrator and software developer by hobby and profession. I'm all about new technologies and gadgets but FB, to me, is really nothing more than a glorified myspace which I didn't find impressive in its hay-day, either. In other words, FB (or social networking in general) just isn't my thing.