I could easily add more qualifiers, but won't. I see the pattern and support my argument: The original poster is but one example. This company (fama.io) is in the business of performing exactly these types of social media background checks. (Reference:
https://craft.co/fama/competitors)
As the masses (and I mean MASSES) of people buy into the social media explosion going on all over the planet, these "low-profile" individuals will A) become rarer, and B) start to look suspicious. Whether the sub-population of computer engineers see it for "what it is" or not; the general population apparently doesn't.
Example: I have a friend who, begrudgingly, created a Facebook account and used it rarely. Several months in, he started getting "friend" requests from (presumably) middle-eastern men, often shown with photos of AK-47s. If this is not a clear demonstration of a IS NULL business rule to figure out who might be anti-social, I don't know what it.
I stand by my prediction as well: Over time, a lack of an online presence (in a world where online presence is virtually required to live modern daily life) will be deemed "anti-social".
The lure (both ease and historical/digital facts) provided by scanning social media history will only grow in popularity.