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4. Simon Kemp. 2021. Digital 2020: Global digital overview — datareportal – global digital insights. Simon Kemp. 2021. Digital 2020: Global digital overview — datareportal – global digital insights.
5. David Keyes. 2012. Saudi writer Hamza Kashgari faces charge of blasphemy after tweets about Muhammad.The Washington Post. David Keyes. 2012. Saudi writer Hamza Kashgari faces charge of blasphemy after tweets about Muhammad.The Washington Post.