I've been around (actively) on Facebook for almost four years now and in those four years I have seen people post, comment, assume, overreact to someone else's posts and do numerous other things that I doubt they would do/talk about/implement/say to someone's face in real life. What's more, I have seen people project themselves as someone they're not and in the process make a fool of themselves. Now I really don't care about what kind of image they are creating of themselves, but when I am involved somewhere, I believe I do have the right to be concerned and I am well within my rights when I choose to object to some of the nonsense that goes around in the virtual world.
This, however, wouldn't have been the case if we all followed a few simple rules and basic online etiquette because not following these basic rules has resulted in having the opposite effect of what Facebook was intended to have. It's obvious that these rules are not written anywhere because THIS is not how Mark Zuckerberg thought people would behave when he created Facebook so he didn't feel the need to put them down in print. But I think it is needed and it is needed now.