You mean people might associate with other people within their race/class, thereby creating a network effect that tends to draw members of that specific racial/

You mean people might associate with other people within their race/class, thereby creating a network effect that tends to draw members of that specific racial/class group to a single social network? Getouttatown! In other news, there is a race/class divide between many of the bars in my city... also, the sun will pass over the horizon tonight, bringing darkness. Story at 11!