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Small message. Facebook have updated their app for iPhone and iPod touch to version 4.0. This is a mayor update with lots of cool stuff!
If you're going to upgrade from any previous version, delete the app first, many of my friends have had their iPhones (4 and 3GS) crashed when starting the app which led to them needing to use DFU-mode to restore it, but when you install it from scratch this wont happen!