The Importance of Matching Technology in Marriages

Today we have several matching technologies that, in some way, resemble this odd marriage market of the aristocracy. The sort of mating is not always a matter of choices, but it's determined by who you meet and usually you meet the people who are similar to you. Do we sort ourselves into circumstances where we meet people who are like us because we like to be around them? Or is the arrow traveling at least a little bit more in the other direction?