I understand that its really "Facebook for Every (non iOS, Win7, Android, etc.) Phone" but doesn't the name sort of imply that its the same app that can be downloaded for every phone? (I know sort of a nit-picky comment)
maybe it should be "facebook for every OTHER phone"
It seems to me (perhaps due to broad generalization) that the sort of user that this would target wouldn't be able to easily load java apps on their phone (I remember having an old moto slivr that required a micro usb cable and a $20 piece of software to sync anything). Also would they even have the data plan to benefit from it (besides being billed at $0.xx a kb)?
This makes me want to dig out an old phone just to try. I'm not not even that into Facebook, but find this really impressive.
Why is it impressive? Java apps for mobile phones have been around for at least 10 years. They could bring out a PalmOS app as well and I'd be just as about impressed. Outside of the developing world, people with feature phones aren't likely to install the app and are even less likely to have a data plan so that it can be used. It fills a checkbox on a presentation slide, but won't make a difference.
The Java mobile apps my kids have (on their feature phones, with data their plans) and that I remember do not look this good. In my opinion it's meaningful to provide software that improves the functionality & UX for 2500 different lines of legacy mobile hardware even though that might not be "sexy."