If Mommy and Daddy are paying any significant part of their college tuition or personal upkeep, they remain dependent and have no more right to privacy than if they lived at home, which in my opinion is "whatever privacy I let you have, probably very little." Hell yeah, I'd keep up with them... if I'm paying part or all of their way, I'd like to know they're spending more time studying than partying.
People blow my minds. Most of the time they call college students "kids" and act protective of them, call them "oh my babies!" and want to coddle them like toddlers.... even though legally they're adults, able to join the military, contract, or marry at will. But then something like this comes up, where they suddenly act like their kids are adults and act horrified at the notion of spying on them, as if they were spying on adult strangers. ( I don't mean you specifically Gina, I'm thinking of certain other people when I say that...)
Well, like I said... if you're paying your own way, good on you, do yo' thing. If Mommy and Daddy are paying a substantial part of your college/upkeep, guess what... you're their dependent still, and they're investing in you, trying to give you a head start in life... if they spy on you a little to see whether you're working hard at college or partying and blowing their money, well that's the price you pay for still being dependent.
Could this be taken to an extreme? Sure, there are parents who try to micro-manage adult children beyond anything reasonable. Is FB "spying" automatically unreasonable? Nope... don't put anything online you would'nt put out there in public, because it is out there in public.