China has blocked chinese people from accessing Twitter, Hotmail and Flickr. It happened two days till the 20th anniversary of Tiananmen Square. It was done to prevent excange of information about massacre of student-democracy activists by the army 20 years ago.

As many sources report it was not so clever step, because there are a lot microblogging sites made in China itself which attract many local users. It seems, that there people exchange information including Tiananmen Square theme. Read more detailed article at New Scientist.

Paulius