Picture this: you are in charge of interviewing candidates for a new position at your company.  You have asked the applicant all of the basic background questions and you did your due diligence before she arrived by Googling her and seeing what information you could find about her on the internet.  When you were searching her name on the internet, you came across her Facebook page, but the information on her profile was not publicly available.  You want to look at her Facebook profile and ask her for her username and password during the interview so that you can properly vet her as a candidate.  Can you do this?  Can she say no?  Does it matter what type of job she is applying for?