Yeah, feels like it's targeting the people who need this service least. Bay area is geek central, or so it's reputation suggests. I just moved to Albuquerque, which is beautiful and scenic and has no existing nerd scene. A tool like this would be incredible for finding or building one, though.
I 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.