if you have the Droid X and you go to the 2nd page there are 4 facebook things you can add people to. I accidentily set someone I didn't want and I can't find a way to edit them out.
Are you using the stock facebook or the facebook for android...I don't think you can delete a contact (unlink profile) without deleting your whole facebook account...I use FB for android and I don't sync my contacts...maybe someone else will venture along with a better answer for you...