[Vaquero]

When I interview prospective entry-level job candidates in my company, I give high marks to those who don't use social media.

If I WAS social networking (which I'm not) and applying for a job. I would tell you I didn't use social media. Of course I don't believe it is a companies business what one does outside of work.
Now retired, while working folks kept trying to get me to join Linkedin. Never happened

[Alberta's Child]

1. If a job candidate tells me he doesn't use social media and it turns out he does, then he's not getting hired -- plain and simple.

2. What you do outside of work is your own business, but when you post things in a public venue then it does reflect on your employer. As such, your employer has every right to ensure that you don't present yourself in an irresponsible or unprofessional manner in your "social media" posts.