How Cellphones, Twitter, Facebook Can Make History [VIDEO]

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While filmed in May, his points are brought into sharp focus by recent developments in Iran (see #iranelection), as social media tools prove their power to change the world.

Shirky explains: "Media is increasingly less just a source of information; it's increasingly more a site of co-ordination, because groups that see or hear or watch or listen to something can now gather around and talk to each other as well...members of the former audience can now also be producers and not consumers."