I like what it's trying to accomplish, but I don't see this as becoming a success.
1. I have no reason to join
2. I will never have a majority of site owners (issue 1 is subordinate to this)
3. Site owners change
4. Who do you really want to get in touch with? The owner? The programmer? Tech support?
5. The barrier to entry stops me.
Personally I'm a bigger fan of humans.txt:
Even google uses it: http://www.google.com/humans.txt
It's a 0-friction way to find out who's behind a site, entirely un-obtrusive, requires the requester give up 0 information.
As a hacker, I have no reason to connect with other website owners. I have lots of reasons to connect with professionals who know what they're talking about.