Why ask for my Facebook if you are then going to ask where I love, and my interests, afterwards?
Do you realise how limiting it seems to ask if I live in:
Palo Alto, CA
San Franciso, CA
Somewhere elseI don't mean to be the "but what about my edge case" guy, but it really does seem like your target audience is going to be denser when you get into cities that don't have thoroughly saturated tech scenes already.
p.s. If there are any HN types in the ABQ/Santa Fe area, please reply and we can grab lunch sometime.
Just because there are lots of similarly-minded people in the same area as you doesn't mean it's easy to make friends with them. A lot of people relocated to the bay area every month, a service like this would be great for them.
Certainly falls under the category of "solving problems of SV 20 somethings" though :P