How To Ask Someone Out For Coffee?

whosethatgirl
Long story short: I think this guy is attractive, and shows some signals of being interested in me. I want to ask him to a casual coffee or something like that. Is it better to do it in person, or online (I don't have his number)? Or, should I ask for his number and ask him out there?
Facebook
Vote A
In person
Vote B
Ask for his number and go from there
Vote C
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GirlGuy
How To Ask Someone Out For Coffee?
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