Should I add him on facebook?

[Bdawg.]

I know this sounds really stupid and immature, but please read on D:
So, for the past three days me and two of my friends have been volunteering at this basketball camp and there's a few other volunteers there too. One of them is this 17 year old guy and he's pretty cute, and really sweet from what I know. I already personally know every volunteer there except this guy, but I'd love to get to know him better. (P.S. I'm 16) He goes to a different school but its nearby. SO, one of my friends talked to him a bit, but I've just had lots of eye contact and a few hi-fives when he scores for our team. Today was our last day for volunteering, and my friend said she was going to add him as they've talked a bit. I probably won't ever see him again, so question is; should I add him on facebook? We have 4 mutual friends. Oh and I'm friends with his 10 year old brother if that makes a difference