Is this weird? and if so can I get some advice on a better way to get her number or get her to hangout?

howzit2015
there is a girl in class with me. I saw her one day in the halls and asked her a question, and it evolved into us talking for an hour or so. I saw her yesterday and she was playing with her hair and laughing at everything I said, and her friend came and she had to go. I forgot to get her number and it was the last day of classes. So I feel asking my friend to ask her via Facebook if she want to come with us to celebrate the last day of classes. I feel like this is a school yard bullshit move, but I have no other way of contacting her.
Is this weird? and if so can I get some advice on a better way to get her number or get her to hangout?
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