It really worries me that there are seemingly so many people on here, apparently with FB profiles of their own, who do not understand how it works. Facebook has privacy settings. On one end of the scale, you can control who sees things you post. On the other end, you can control every last piece of information you put on there (for instance, when making a status update you can select who can see it). I have the maximum privacy settings enabled, and whilst I cannot accurately tell you how to do this, there will be a gazillion comments and articles on the internet to show you how. Only my 'friends' on Facebook can find me in a search. In order to add me as a friend, somebody must know one of my friends. If you don't, searching for me on Facebook reveals nothing, and NOTHING related to me appears on a google search. As responsible teachers, everybody reading this should have the same high level settings. It's a matter of principle.