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The group originated in October 2009 when a group of bloggers organised demonstrations using word of mouth , Twitter and Facebook , culminating in No Berlusconi day on 5 December 2009 .
 Berlusconi
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berlusconi