Image by Transguyjay via Flickr Every time I present at a professional association, I am reminded by some of my attendees that they cannot access LinkedIn or other social media sites at their work.  And it always surprises me.  I always end up teaming up with those wanting to convince their superiors that, with the proper rules, they should be embracing selective social media sites.  And the root of the problem seems to be the same: their superiors just don’t seem to fully understand the various sites that are out there or are taking knee-jerk responses to something reported in …