When Twitter has the starring role in the lead item on the 6pm news, you know that social media is a real phenomenon. Talking about Iran, Kevin Anderson from the Guardian said " Regimes that used to keep an incredibly tight control on information have lost that control. In the past this (..the conflict over the election results..) would have been airbrushed out of history"
The twitter feed is Persiankiwi and is a current and graphic example of the twilight of sovereignty referenced in the previous post.
This sort of activity is seen as liberating in the context of repressive regimes - providing transparency and a voice for the people outside of tightly controlled media channels. But it is global - the disruptive force of social media makes no judgement on the government that it disrupts.