Interesting article. It doesn't look at corporate/social media censorship, but government and ISP censorship is still dangerous.
I found quite surprising that Japan censored The Washington Post and the Wall Street Journal for G20. What would be the reason for that? It's not like they would provoke disturbances.
Also, ISP censorship on Norway. Corporate overreach, or unofficial cooperation between them and government? They really need some Net Neutrality.