Just before the release of iOS 4 the Facebook iPhone app [iTunes] was updated, and to the surprise of many it did not include iOS 4 support. That’s changed today as a new update for the Facebook app has just been pushed out. According to the notes, Facebook v3.1.4 includes support for fast app switching in iOS 4 and high resolution icons for the iPhone 4. It has also added Korean and Russian localization and “minor bug fixes” which could be just about anything.