Interesting (and creepy) idea, but I would say definitely not. I'm sure that a) there are enough trolls that it would be useless, b)it would be too complicated to connect a username to a real person, and c) they could be sued for stalking if they used the info.
While Big Brother could easily be watching
(I was actually just reading an article about companies using purchases to track consumers), I doubt the colleges will, considering all these posts full of eager beavers desperate to apply. Why bother?