I think a 'find other hackers site' is a great idea. Given that you are a hacker yourself, why don't you make a site like this? If it was well made, I would use it.
I would really like there to already be something out there, it seems those things that are close tend to trend more to the Q&A genre like Stackoverflow and Quora (lots of money in this area right now it seems) but what I imagine is really more about creating connections. Closer to eHarmony than Stackoverflow. If something isnt out there I may try to throw something together if I can figure out how to monetize it, I picked up thenextcubeover.com just because it was the first thing that came to mind.
I am a corporate developer. I'm in my tenth year in the industry, and work so much that all I have a passion for anymore is programming, frameworks, algorithms and hardware. It would be great to find other people to hang out with that love the same thing (instead of trying to relate to people that don't). Every time I try to make new friends I feel like the world's most boring alien. Hanging out with work friends is kinda awkward. I used to be able to relate to people on video games and movies, but I don't have time for those anymore :(.
I imagine there are a lot of us, we should have a way to find each other.
I would imagine the biggest challenge something like this would have is keeping the recruiters out.
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