Facebook Help
 

Is it possible to contact a facebook user without showing yourself?

Instead you post to that user as a facebook page.

EXAMPLE:
So instead of like 'Billy has sent you a message'
It'll come up as if it says 'George Lamb 2 Win BB sent you a message'

It is because I'm always getting messages off them (which is really annoying), but I dunno how you would do it.

yeah it is, i can't remember how though.