The Berlin Twitter Wall site was blocked in China on Monday afternoon Beijing time, according to the KulturProjekte Berlin, the non-profit arts organisation running the site.
Because it uses the micro-blogging site Twitter, users in China can still post comments, but their fellow Chinese internet users cannot read them.
“When we launched it on October 20, we got a lot of worldwide attention, so naturally Chinese people have seen it as a way to voice their opinions about internet censorship in their own country,” Carsten Hein, the project co-ordinator for the site, told The Local.
The site asks users to voice their thoughts on “which walls in the rest of the world should in their opinion now fall.”
Part of the Berlin government’s official celebrations for the 20th anniversary of the fall of the Berlin Wall, the site has been bombarded with comments in Chinese, Hein said.
The fall of the Berlin Wall has long been a sensitive issue in China, as it came just a few months after the 1989 Tiananmen Square massacre, in which the Chinese army killed several hundred pro-democracy protesters.