Constant pressure is put on blocking pornography, and other threatening material, which include bans on Facebook and Twitter.<ref>[http://www.nytimes.com/2009/12/18/world/asia/18china.html?_r=1 NYT]</ref> | Constant pressure is put on blocking pornography, and other threatening material, which include bans on Facebook and Twitter.<ref>[http://www.nytimes.com/2009/12/18/world/asia/18china.html?_r=1 NYT]</ref> |