Why doesn't my iphone vibrate when I get facebook alerts?

I have it set to all the correct settings, but it just doesn't vibrate or anything when i get notifications on facebook. It will just show that I have ya know 3 things or watever on the facebook icon. But I have it set to vibrate when I get something and it never does… And actually half the time it doesn't even show that i have a new fb message/comment… Ill just click the icon and go to fb then i realize i do have messages or comments. Wat the frig?

Settings < Notifications "Facebook"

From there make sure you have banners, alerts, or whatever you prefer and make sure that "Sounds" are enabled because that is what will make the alert vibrate in silent mode. Check the notifications settings in the Facebook app to see what you will be notified of.

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