Last Wednesday we had Pablo Gerbaudo presenting his book Tweets and the streets: Social Media and Contemporary Activism at the Center for Civic Media. It was a great opportunity to share ideas, and research, about the use of social networking sites in social mobilizations in the: Arab Spring (in Egypt), Indignados (Spain), Occupy (USA).
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Though sound quality is not the best, you should be able to understand the talk,. It is the result of a live stream and on the fly editing.