This is a great address. I think it is too easy to lose sight of the fact that we are living in a period of profound change. It’s worthwhile to step back occasionally and take stock of that fact and put yourself in context. The video is from TED; here’s the description from the site:

While news from Iran streams to the world, Clay Shirky shows how Facebook, Twitter and TXTs help citizens in repressive regimes to report on real news, bypassing censors (however briefly). The end of top-down control of news is changing the nature of politics.