Frredom of Speech
At the moment the government would probably like to shut down all forms of social media ... because they've been getting hammered there for so many embarrassing missteps, faux pas and incidents of downright incompetence of late that they've finally realised that just having the Murdoch Press on their side is not enough to insulate them from the furnace of public indignation.
They'd love to shut down Twitter, FaceBook, Digg and any number of platforms. To hammer Google and especially You Tube for all those nasty parodies and endlessly repeated news items that so distress them.
Can they do it? Not in this universe. But that won't stop them from trying ... obviously on 'national security' grounds.