I think it is Orwell's 1984 where people are employed to go back and "edit" newspapers after the fact...to change history as it were. I may have the wrong book, but the memory sticks with me from somewhere.
Ever wondered about when we get to the day where we have no print news and the only archives are electronic? How easy will it be for someone to change an old online article from five years ago to "clean it up" or alter it in someway?
Just something to think about.