So far there are no reports that healthcare organizations are engaging in this conduct. However, healthcare employs more than 14 million people and there are unquestionably huge consequences for providers who hire the wrong people. In this era of draconian HIPAA penalties, healthcare organizations are understandably sensitive to the implications of social media.
For anyone thinking about asking that job applicant across the desk for their Facebook password, don't do it.
The nominal information about that person you may glean from a social media site is of no value when it's compared with the damage inflicted on that essentially powerless person's sense of dignity. And even if they're "lucky" enough to get hired, it will be impossible to ask for their loyalty and trust after you've failed to extend it to them.