On August 3, 2012, the Guangdong provincial government announced a new regulation on its official website. With the exception of the Guangdong Provincial Warning Release System, no organization or individual is allowed to release any warning or information to the public regarding an event that may cause serious harm to society, a natural disaster, an accident, or a public health incident, including those that are happening or are about to happen.
No one is allowed to issue any warning or make any announcement, such as for the recent storms in Beijing, on any personal microblog.
Source: Guangdong Yangcheng Evening News (http://www.ycwb.com), August 9, 2012
http://news.ycwb.com/2012-08/09/content_3905933.htm