When I read this the other day, I thought hell no. Reality is if you are hungry or been out of work a bit, you know you would give it up and hope the work police didn't somehow become offended.
I think in modern times, you need to assume companies will at a minimum Google and FB you. Not much shows when you google me, and I'm crazy careful with permissions and content of what I post on FB. It's a slippery slope tho...what I find offensive/wrong may not be what a business does. If that were the case and it cost me a job, my arrogant self would say "I didn't want to work for people like that anyway." However, if I were hungry or facing financial hurdles, it would be completely different.
The industries I've worked in for the last 20+ years have required me to have background investigations at a minimum. Most times it's background that also includes criminal and financial screens. Clean living so far, but scary to think where I would be with a foreclosure, bankruptcy or a DUI in my past. I'm also thankful for not having access to the internet and cell phone cameras during my teens/twenties -- no need to record the worst of those years for all the world to witness!