NEVER ASK A GIRL OUT THROUGH FACEBOOK
NEVER
NEVER
NEVER
NEVER
You don't want to give her a couple days to mull it over, talk to her friends, and think about it! You want her to feel "on the spot" and be unable to have a reason to say "no" when asked in a face-to-face situation. It completely removes the pressure from the request and lets her insert her hidden doubts over 24-48 hours before responding. Dumb dumb.
It ranks like this:
In person
Phone
IM
Facebook
DON'T DO IT!
It's so dumb.
dumb dumb dumb
PLEASE DON'T DO IT FOR THE SAKE OF GUYS EVERYWHERE
This.