pretty weak explanations: "millions of others do".
millions are in prison rotting for murder -- would you consider that a "good thing to do" ?
social in web is still inmature. most facebooker are on the war of whom got more friends on their list -- something in real society does not happen. most myspacers upload photos next to "cool" stuff, like friends porche claimed their own, owesome vacations that never took place, etc -- something in real society does not happen alot OR you are pushed outside the circle. what you see right now is very inmature social.