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And the violence in Sri Lanka last spring is also worth mentioning. https://www.theguardian.com/commentisfree/2018/may/05/facebook-anti-muslim-violence-sri-lan

• Axsuul 8y ago
  "The assertion from senior government officials, therefore, that the ban on Facebook put a stop to the violence is inaccurate. Data scientists and researchers have flagged that the block on social media did little to deter the mobs, who found their way around it with ease. While not entirely blameless, Facebook also became an easy scapegoat."