Clay Shirky: "How cellphones, Twitter, Facebook can make history"
Clay Shirky gave a talk entitled "How cellphones, Twitter, Facebook can make history," at a TED Conference in June 2009. He does a good job of placing the Internet in the context of other media -- newspapers, magazines, radio, television, etc. -- and in historical context. He also gives several examples of mass public use of the Internet in politics.
The talk is 17 minutes long and is here.
You will find comments and discussion there as well as on YouTube.