What to say to a guy on Facebook chat?

Recently, I've been talking to this guy that I kind of like on Facebook. Well, not really talking, more along the lines of we like each others' statuses and occasionally have conversations in the comments about them. We never talk at school and don't have any classes because he is in the grade above me. But I want to start chatting with him (via Facebook) and I was just wondering what I could say to him. Please help!
What to say to a guy on Facebook chat?
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