1. Facebook Help CentreWhat are recommendations on Facebook?https://www.facebook.com/help/1257205004624246
2. Commission for Countering ExtremismChallenging Hateful Extremism
3. WhittakerJ.Online Echo Chambers and Violent ExtremismThe Digital Age, Cyber Space, and Social Media: The Challenges of Security & RadicalizationDhaka Institute for Policy, Advocacy, and Governance
4. WatersG.PostingsR.Spiders of the Caliphate: Mapping the Islamic State’s Global Support Network on FacebookCounter Extremism Project2018https://www.counterextremism.com/sites/default/files/Spiders%20of%20the%20Caliphate%20%28May%202018%29.pdf
5. WalkerK.Four Steps We’re Taking Today to Fight Terrorism OnlineGooglehttps://www.blog.google/around-the-globe/google-europe/four-steps-were-taking-today-fight-online-terror/