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A virtual memorial marking the 20th anniversary of the fall of the Berlin Wall has become an unexpected platform for another cause.

The Berlin Twitter Wall invites people to post their thoughts on the historic fall of the Berlin Wall in 1989. But it's instead been dominated by messages from Chinese netizens pushing for the collapse of another wall—the Great Firewall.

One tweet says, “We climb the Great Firewall because it has blocked out all dissent, and we do so to eventually get rid of the Wall.” Another says, “Nothing can stop one’s quest for freedom.”

Spooked by the rapid development of cyber-communication, the Chinese regime established The Golden Shield Project, commonly referred to as the Great Firewall. It prevents people inside China from accessing online information deemed inappropriate by the communist regime—including things like dissident opinions.

According to the Canadian paper The Globe and Mail, the Berlin Twitter Wall has been blocked in China since Monday night.