I can't seem to find anyway to remove the facebook icon and the (I think) number of messages from appearing on the external display. Is there setting or something that controls this?

Yes, go to options>display>external display
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That didn't work. The facebook icon and a number to left of it are always displayed on the external display.

Did you try logging out of FB and then see if you get the notification?
Posted via BlackBerryForums.com Mobile

I have this same problem. I have a BB Curve 8520 and can't find the display section under options to even try this : (

I logged out of the facebook app I stopped receiving notifications. I would also suggest checking your notification options on facebook via computer and see if that helps.