There's this girl in my school that i'm interested in, i'm her ex-classmate for 2 years. We chatted a few times, our status are merely casual friends. Once i bumped into her on the way to a library from school, she asked me to eat with her as the food court is in the vicinity. Whenever we chance upon each other in school, she always try to initiate convo with me. I remember one time she saw me walking down the school corridor together with a girl, her eyes are fixated upon me (i can tell coz i'm looking at her too). Btw, I'm a withdrawn and introverted guy. After piecing the events together i just realised that she may be interested in me. Our final exams are over, and we have a lot of free time. I just broke up with my girlfriend a few months ago. The thing is, i don't have the girl's phone number, only her facebook contact. Since she is not online often on facebook, the best thing is to send her a private message. Would that make me a wimp? Or should i facebook chat her up first before proceeding to ask her out?

The message would be (i'm trying to sound casual) :

Hey, how's your a lvls? We haven't talk for long, you wanna hang out with me? Just wanna get to know you better. Haha. What's your phone number btw? I saved your old one in my phone but you changed it right?

"let's hang out some time over the break, what's your number?"

short and simple; if she's attracted to you she'll comply otherwise she'll make up something.