Facebook app on iPhone not working properly?

So i updated the Facebook app on my iPhone and it worked fine until 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. What can i do to access all of the features?

I'm an Apple pro. If you go to Facebook, you can see my group, how we talk post and chat. In order for it to work, you must first delete the app. You reboot the device, then you download it again. If this doesn't work, try updating the app, if a new update does exist. If not, you must wait.

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