The interpretation of the study presented in the article may be completely amiss or just a correlation vs. causation problem. Facebook started out in colleges

The interpretation of the study presented in the article may be completely amiss or just a correlation vs. causation problem. Facebook started out in colleges - maybe college education provided to the poor via scholarships made them mingle with the rich, that is why you see the association? To see this and conclude nepotism as the cause is a bit stretched...