I don't know how subtle this tactic is, but if a girl (especially one I don't really know or just met) stops to make conversation with me... I mean if she just basically takes time out of her day to chew the fat with me for like about 10 - 15 minutes, I know two things: she really likes me and she's someone I can talk to/ have fun with.
Talk to the guy and let him get to know you.
Just tell him.
Facebook.
Give him little hints that you like him.
that's why flirting is around, mainly flirting will let him know that you like him
Write him a note or tell one of his friends to let him know that you like him.
Let him down gently and let him know you are not interested.
Then don't let him know it hurt you.
by askng him out
Well then try and talk to this guy about his interests and let him get to know you. Don't just talk about him though when you're with him also talk a little about youself, take it slow and let this guy get to know the real you.
Tell him! :) Be honest. Let him know how you feel. You never know he might feel the same.
let the guy you like know you like him to and if he feels the same way he will ask you out