Human beings are complicated. It's hard to say what makes a real connection between two people. And I mean more than following someone on twitter or being on their friends' list on facebook or following the same blogs they do. I mean something that makes people "click". I thought it was mostly the "birds of a feather flock together" theory, but it's not. There is no scientific or mathematical formula for it, otherwise dating sites like Match.com would be out of business.