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Even if Facebook itself isn't used as much, there will still be people using it, and unless it goes the way of Myspace and gets bought up by someone like Timberlake and redesigned, it'll still exist 20 years from now and further on, including all the data that's there. And, barring any mass social ideological revolution in which all of a sudden total and utter privacy is regarded over any other attribute, there'll always be something akin to Facebook. It's not the details, but the concept.