There is another point to consider. Some people CANNOT join Facebook because
of their job requirements.

I'm genuinely curious.  I realize that some people may have job requirements
that would preclude them from signing up for FB with their own, modern name/
information.  But, how would a job keep one from creating a "FB persona"?
I have a friend who works for an excessively conservative company, who
did just that, so that the people at her work wouldn't know anything about her
"edgier" friends.