[RazzBerry]

Straight from the FaceBook Help Page (laughter occurs here):
This one straight from a search of help on BlackBerry 10:

I'm not getting notifications about activity on Facebook.

Check your notification settings. Click View or Edit next to the notification types you want to receive and make sure the appropriate notifications are turned on.

If your settings are correct and you are still experiencing this issue, please let us know.

This one under their KNOWN BUGS section:

Facebook Mobile Apps (iPhone, Android, etc.)

Something's not working with the Facebook for iOS app.
If something's not working with the Facebook for iOS app, first make sure you have the most up-to-date version of the app. To do this:
Go to the App Store on your iPhone and update the app. If there's a newer version of the Facebook app you don't have yet, it'll be listed there for you to download.
If this doesn't solve your issue, please file a report from our Mobile Help Center. To get to our Mobile Help Center:
Open the Facebook for iOS app
Tap (top-left of any page)
Scroll down and select Help Center and find the information that best matches your issue