I think you've just hit on the legal remedy for this bullshit.

It is illegal for an interviewer to ask about your religion, your race, your age, your political views, your sexual orientation, etc. All of those things are part of the typical facebook profile so asking to even look at someone else's facebook profile for purposes of an interview is a clear violation of the law.

Here's a list of things that an interviewer is barred from asking: http://jobsearch.about.com/od/interviewsnetworking/a/illegal...