4500 undergrads, 1500 graduate students, and hundreds of faculty, and you think that every little paper they give or study they conduct is a product of the whole in a meaningful sense?
The study was practically just a thought experiment by two grad students looking at something outside of their expertise. It _only_ got any attention, because it was about Facebook, and so the media saw a chance to sell more ads. For the same reason, they used the metaphor of pars pro toto as a rhetorical ploy, because Princeton vs. Facebook sells more ads. Like many among the unthinking masses, you got punked by it.