六四周年: 中国严控微博 封杀措施空前 (Online censorship reaches unprecedented scale on June Fourth anniversary)
British Broadcasting Corporation, June 4, 2014
www.bbc.co.uk/zhongwen/simp/china/2014/06/140604_june_four_social_media_censorship.shtml
One legacy of Tiananmen: China’s 100 million surveillance cameras
The Wall Street Journal, June 5, 2014
blogs.wsj.com/chinarealtime/2014/06/05/one-legacy-of-tiananmen-chinas-100-million-surveillance-cameras/?mod=chinablog
LinkedIn is censoring posts about Tiananmen Square
Quartz, June 4, 2014
qz.com/216691/linkedin-is-censoring-posts-about-tiananmen-square-even-outside-mainland-china/
