Here's a link to a YouTube video about the role of twitter in the current Iranian crisis:

http://www.youtube.com/watch?v=dHp2lqYcf3I
The Revolution Will Be Digitized: Nico Pitney's Live Iran Blogging @ Rachel Maddow

"Nico Pitney on "The Rachel Maddow Show" discussing his live blogging on Huffington Post of 2009 Iranian Presidential election aftermath - June 16, 2009"