Social Media Revolution : How does news disseminate?

Whether it be Facebook or Twitter... or any other social community sites alot of us get our daily news updates from these pages.

The recent events in Egypt and the Middle East in general have been instrumental to demonstrate the role of social media as a tool for systematic social unification.
At a time when cell phones have been shut down by the government, internet remains the main medium for connection.
However, it is not the first time social media has played a political role and made history. During the Iranian elections of 2009, when there was alot of discussion regarding the validity of the election, Twitter or more generally internet was the only bridge between the citizens and outer world.

Internet and its limitations are subject to discussion to many governments around the world. Chinese government has blocked Twitter and many other sites to date and in Turkey YouTube was very recently opened up.

I am sure there are many more examples of these around the world that I have failed to mention. This is just a thought exercise to get us questioning the way we are heading and the new forms of social and political revolution. I'd love to hear your examples and thoughts.

AO