@Article{best-friends,
  author =	 {Peter DeScioli and Robert Kurzban and Elizabeth
                  N.~Koch and David Liben-Nowell},
  title =	 {Best Friends: Alliances, Friend Ranking, and the
                  {MySpace} Social Network},
  journal =	 {Perspectives on Psychological Science},
  year =	 2011,
  volume =	 6,
  number =	 1,
  pages =	 {6--8},
  month =	 {January}
}