They really don’t, and often they are in positions of power with enormous capacity to abuse.
Take this story from a blog post I was alerted to via Twitter. Deep in the comments was this human interest story:
“defriending my bosses boss
on facebook sent her into a rage where she accused me of writing
something I did not & on her hearsay they fired me after a very long
If a manager gets upset because an employee defriends them, perhaps they should reconsider their fitness for that position. Their boss certainly should.