Over the past week, YouTube was temporarily banned in China. It was unbanned again yesterday. The reason why it was banned was because China was criticized over a video that was released by the Tibetan government in exile. The video showed Chinese security officers beating handcuffed Tibetans.
People in Beijing found a way to get around the block by using special software to enter the site through a proxy server. This is a common way to access websites when they are banned by the government which happens often.
The Chinese government quickly responded to the alleged video. They stated that the police beating a Tibetan to death in the video was a lie concocted by supporters of the Dalai Lama.