I found that the following worked:
Blackberry 9000 v 4.6.0.162 / Facebook app 1.9.0.28
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You can not delete your notifications.
It is possible to delete notifications on Facebook, by clicking the globe at the top of the search bar. Next, click the X on the right of the notification to delete it.
If you wanna stop facebook notifications go onto settings>notifications>facebook and then turn sounds , alerts and badges all off. i work for apple California i would no Trust me
The Facebook notifications on the iPhone will disappear after one clicks on them. This is the only way to get rid of them once they are delivered. To stop receiving notifications, one can log into Facebook and change the settings in "Mobile" under the "Settings" menu.
You can't. They disappear after a short period of time.