I think it's kind of like house hunting. Sometimes you'll see listings where there is only one photo, and it's of the outside of the house. You can't help but wonder about what they have to hide, right? If it had a huge kitchen and nice bathrooms, wouldn't they want to put these on display?
It's obviously not fair to treat job candidates this way, but in a world where social media exists, I can understand it being difficult for this thought to not cross the mind of an employer.
http://news.yahoo.com/job-seekers-getting-asked-facebook-pas...