That's exactly where I make that distinction. Then again, I came through college just as Facebook started picking up steam (my freshman year was in '05 when th

That's exactly where I make that distinction. Then again, I came through college just as Facebook started picking up steam (my freshman year was in '05 when the number of college networks expanded from a couple dozen to practically everywhere). It's been, by original use (and force of habit), solely a personal networking site in my eyes. Things may have been different for me if I didn't join until after the "universities only" days, but then again, LinkedIn and Twitter had already gained plenty of traction in the "professional networking" arena by then -- and that's where I do most of my professional outreach (in terms of social networking sites).