When i first got my D1 last Nov when they released it for about a month i got fb notifications. Just like if i got a text message the phone would go off and there would be the little fb icon in the top left corner. Then just stopped randomly and never did it again.....i just got my replacement phone today which is a D2 and my friend said a new facebook update that overhauled the app was released so i was hoping for a fix but i havent seen one notification yet. But come to think of it my friend doesn't get them either on his Evo so it must be a problem with Android blocking it or more likely the fb is still garbage and they havent fixed this yet.
I doubt it is a Facebook only issue. The Blackberry app was flawless. I NEVER missed a notification.