There are definitely upsides to this, like being able to put your general geographic area than your exact town which you might have on Facebook, for instance. But I'm curious also if it is usable to be downright dishonest.

For one, I think people will be less willing to lie in a form where one company can see both profiles, but on the other side, it comes down to what Facebook lets you change. Hopefully they won't let your profile specify two different ages, for instance.