Help! I want him to add me on fb?!?

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So I was in library with my friend during period 1 because we wanted to print some stuff and there was this guy (his class was in library) my friend was busy printing it and I was like "u print it I'll go and get it from the printer" I was walking towards the printer when that guy's friend said ( his friend is in one of my class) "hey, what's your name" and I was like "why do u want to know my name" and he pointed to his friend and said "this guy wants to know ur name" and I smiled and went to the printer to get my papers and I didn't tell him my name! Later that day I asked that guy, (his friend) that why did u ask for my name and he was like that guy likes u! And the thing is he's pretty popular and why would he like me! I'm pretty tho but not popular! Now I want him to know my name and now I really want him to add me on fb but I don't know how?