While pondering the Facebook.com phenomenon, I realize that many younger users have never seen a real facebook. For their edification, here is the back cover of mine from 1978-79.
You had to buy a facebook back then. Mine cost $2.50, which equals about $7.75 in today's dollars.
By contrast, Facebook.com is free (not counting lost productivity at work for users).
My how far we have come (or gone)...