I am very happy to tell you that it already exists!!!!! http://www.bizfriendz.com/ http://www.bizfriendz.com/ The part that sold me is that they spelled frien

I am very happy to tell you that it already exists!!!!! http://www.bizfriendz.com/ http://www.bizfriendz.com/ The part that sold me is that they spelled friends with a "z". Seriously though: have you heard of gobignetwork.com? cofoundr.com? I think the ratings you mention would be meaningless. I don't think a social network is the best way to organize an event. I don't think social networks are good ways to meet cofounders. I think existing networks solve your other problems. Sorry to godzilla your tokyo, I may be wrong and/or stupid.