At one of the schools I work at is a wonderful technology teacher that is constantly forwarding great links to information to use in class.  Recently she sent us a link to a short movie that has to do with teaching kids to think about protecting their reputation while online.  Considering the many examples of adults posting stupid things to their Facebook and Twitter accounts I kind of have to think that this would be good information for teachers to take a look at too as well as share with their students if the opportunity arises.  The video is called Protecting Reputations Online in Plain English and is made available by a web site called CommonCraft.  It presents a very useful message for those who are not up to speed on exactly how the Internet archives all of the information that is posted to it.