Would Facebook ever(relatively) be replaced like it replaced myspace(kinda)?

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It seems in some ways inevitable, but if you agree that it will happen, how long do you think FB can last? And if you believe that facebook can last across generations, how do you think it would effect society and such? And surely it will have an impact even more than we've experienced so far... Such a thing changes the way we deal with people of our past...our co-workers. It may even have possibly broken down some barriers, connecting different periods and aspects of your life.