i just downloaded the fb app and i dont get notified when anything happens. I can write on other peoples wall and all but i dont get notifications. this may have something to do with my facebook login email not being an uploaded email address on my blackberry? i have heard problems about not getting all of your notifications but i get none.
Might sound dumb, but did you go to facebook on a PC and set up your mobile settings? I think that'll probably help. I believe when I first started, I had to do that too.