‘The Friend of My Enemy Is My Enemy’: Virtual Universe Study Proves 80-Year-Old Theory on How Humans Interact

I’m not overly interested in the study itself, but rather the method used. 

A new study analyzing interactions between players in a virtual universe game has for the first time provided large-scale evidence to prove an 80 year old psychological theory called Structural Balance Theory. The research, published in the Proceedings of the National Academy of Sciences, shows that individuals tend to avoid stress-causing relationships when they develop a society, resulting in more stable social networks.