What are our motivations in choosing our online friends? In our recent paper in PRX we study high-quality data and show how we can estimate the influence of different social drivers. In simpler words, how probable is it that we reply to friend requests or how often do we connect to popular people? Although we may not realize this, our connections evolve and we may find ourselves in an environment different from our choices. Physics Review X 2, 031014 (2012). pdf