Another question about this study is the effect of self-selection. In order for the researchers to collect the specific traffic data for the group of people in the study, I am assuming that the students had to give permission, i.e. sign a waiver, to permit such access.

Given that if I knew I was in a study, and that my internet usage was going to be studied, that would affect my usage of the internet. I might not download movies, or watch as much porn. Perhaps I wouldn't visit Facebook from the university networks.

Even if unconscious of the act, knowledge that they were being studied could easily have affected the resulting data. I would like to see if and how this was controlled for.