Facebook iPhone app not working properly?

So i updated the Facebook app on my iPhone and it worked fine untill it crashed once and since then it doesn't have the new chat system and its basically the same... I reinstalled it like 6 times and restarted it and the phone and everything... I have an iPhone 4 with iOS 6.1.3. It works fine on my friends... show more So i updated the Facebook app on my iPhone and it worked fine untill it crashed once and since then it doesn't have the new chat system and its basically the same... I reinstalled it like 6 times and restarted it and the phone and everything... I have an iPhone 4 with iOS 6.1.3. It works fine on my friends iPhone... How can i fix it?
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