“Signing 08 Charter (the document for which Liu Xiaobo was sentenced to 10 years in jail);
Attending, or expressing interest in, Jasmine gatherings;
Signing online appeals, in one case, for improving prison management; in another, against the detention of a Uighur scholar;
Intent to attend events organized by Ai Weiwei (this was before Ai Weiwei was detained and held for 86 days last year);
Attending the memorial of a woman who self-immolated to protest against violent demolition; Writing blogs or articles on the themes of democracy and freedom, about June 4th, Tibet or Xinjiang;
Twitter expressions;
Sending a bouquet to the Norwegian Hall of Shanghai Expo in connection to the Nobel Peace Prize being awarded to Liu Xiaobo;”
Reasons Chinese citizens may be called in to “drink tea,” or be questioned by security officials
Source: chinadigitaltimes.net