If you have the email account that your notification are sent to on your blackberry, you will not receive an email(on your blackberry) notifying you of the event. Instead, the facebook notifier pops up.
Interestingly enough, if i log onto gmail, i have an email notification.
All of my other email was pushed to my blackberry. So my interpretation of this app, is that it 'intercepts' either on the blackberry, or on RIMs servers and blocks the email and makes a notification for it.
The more i use the app, the more useless it seems to me. Along witht he quirks mentioned above(no view/edit profile, the application icon when its running) i feel like this app may have been rushed.... anyone else feel the same way?