Sources

delong: RT @busynessgirl: RT @ Social media in the 16th Century: How Luther went viral | The Economist http://t.co/K0sByAWf #297sm

Grasping Reality with Both Hands: The Semi-Daily Journal Economist Brad DeLong: Twitterstorm delong: December 21, 2011

howardlindzon: RT @Werner: How Luther went Viral - Social media in the 16th Century http://t.co/Sw9IvZ8F /in @theeconomist

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