Reversed dating
cheekd.com
cheekd.com
1. you need to explain it - it is not obvious for the user. That's bad if you hand someone o card and need to explain it
2. if this is a guy to hand this card to the girl it sounds a bit like: a) I am geek using this service b) I am not confident to give you my phone number. Are these advantages in dating game?
Nice idea.
(And the marginal case where you want to revoke the ability to view your details after you give out the card, but before the person checks...hmm...)