The academic paper writtten by Orkut & co., analyzing the Orkut.com precursor, Club Nexus.

] by Lada A. Adamic, Orkut Buyukkokten, and Eytan Adar
]
] We present an analysis of Club Nexus, an online community
] at Stanford University. Through the Nexus site we were
] able to study a reflection of the real world community
] structure within the student body. We observed and
] measured social network phenomena such as the small world
] effect, clustering, and the strength of weak ties. Using
] the rich profile data provided by the users we were able
] to deduce the attributes contributing to the formation of
] friendships, and to determine how the similarity of users
] decays as the distance between them in the network
] increases. In addition, we found correlations between
] users' personalities and their other attributes, as well
] as interesting correspondences between how users perceive
] themselves and how they are perceived by others.