Facebook for iPhone not working?

I don't know if it's my Facebook or my iPhone. I got an iPhone 4s a few months ago and anytime I would get a notification my iPhone won't vibrate. I went in settings and I put vibrate on I turned it on then off and it still won't vibrate. Even when I get a message from Facebook it won't do it. Anyone help?

Reinstall the app. I suggest you connect your computer itunes and add the app on there

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