Facebook is interesting in that now you can know for certain that not only have those embarrassing pictures been seen by all your friends and any prospective romantic interests or employers that you may have, but also that they have been indexed with your name, backed up regularly, and cached by a number of search engines and other services. Whereas once upon a time you could maintain false hope, you can now rest assured that, come an apocalyptic event, the world will be populated exclusively by cockroaches and pictures of you playing Guitar Hero with a lampshade on your head.