what should i do about this girl I like?

[Kenny]

i joined a facebook group online for the college i will be attending next year and ive talked to some people, i even got my roommate but there is this one girl who is just so cute. she followed me on twitter and i followed her back and she has favorited and replied to some of my tweets and vice versa. we havent really talked like on fb chat but i would rather not, atleast not right now. i would love to get to know her in person and maybe become more than friends, but im not sure how to do that! im going to a large public state school so idk if ill see her around. i wanna ask for her number when the time comes that we are leaving but im scared. i really do wanna be friends with her and maybe something can sprout from that. im not looking for sex i just wnna get to know her and see where things go but idk how help please!!!!1