If partner selection was as simple as being hooked up and talking to a total stranger for a few weeks, there would be no dating-sites, and blind dates wouldn't be dreadful. There's a reason first dates are often for a early-evening drink in a bar - if just talking long enough would do the trick, first dates would be in a secluded cabin in the mountains :).

I like your thoughts on targeting young professionals, and basing it on an existing network such as LinkedIn also sounds reasonable. Your focus on keeping personal information out of the conversation is not viable - remember, it's not just e-mail and phone numbers, it's also suggestions to meet. I also think that the fee to be hooked up with a second person is going to be a major deterrent.