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You can subscribe to news sources on facebook but its not the same as reddit is submitted by users and moderated etc twitter is kind of where everything gets sent eventually. Digg for the most part shot itself in the foot by not managing itself properly and banning trouble makers who were deliberately going on and being asholes to make the site look bad ie redditors.
I know that some redditors were active on digg in trying to bring it down i dont see why they would other that they were the main competition to reddit. All that did was move people from digg to reddit so you now have the digg crowd that reddit hated so much on reddit. kind of counter productive if you ask me but reddit is a comical venture i think redditors forget this and still regard reddit as the underdog.