Ok so my sisters 8100 is going crazy! The facebook application is on the main menu, but when i go to the applications menu to delete it, i cant....Whats the malfunction?

delete the service book for it. Now it will come back next time you send service books. So just hide it if it gets annoying.

Wirelessly posted (BlackBerry Curve 8320)

You might have to do a battery pull first. If that doesn't work, I remember seeing this as a Service Book instead of an application sometimes. Go to Options > Advanced Options > Service Books and see if there is anything listed there.