I wasn't able to for the longest time, so I re-installed it and now it's working. BUT, when I do get notifications I don't get the notification sound even when it's on normal mode. I don't even get a LED signal.
I was having the same issue, no notifications for a while so I reinstalled and now I seem to be getting them... but has anyone noticed you can't look at comments? Every time I look at a picture or link comment, it shows the message "The Facebook server is unable to retrieve the post at this time. Please try again later." Getting really annoying.
I haven't gotten fb notifications for about 24 hours. I will try re-installing the app. However fb is upgrading the new profiles, that usually messes up notifications.
Uninstall FB on your phone, log into Facebook on the computer, go to privacy, applications, delete the facebook for blackberry application and redownload and install FB on your phone and all will be fine again