"To immediately exit out of facebook when a "friend" you do not want to chat with (or know you are online) pops into the chat
window."
I have a few facebook friends who are nothing more than old acquaintances, and I should have really thought twice before being their Facebook friends (ie.
people I never want to see again). Whenever they come online to Facebook and appear in the chat window, I have to face-
book before they know I'm on too.