How did the Chinese government restrict information about the 1989 Tiananmen Square incident in the years following the event?

In the years following the 1989 Tiananmen Square incident, the Chinese government implemented significant measures to restrict information about the event. This included officially downplaying its significance, labeling protesters as "counterrevolutionaries," and minimizing the extent of the military's actions. Public commemoration of the incident is banned, and references to it are generally suppressed.1

Furthermore, China employs the "Great Firewall," a system of Internet control that filters and blocks online content deemed detrimental or destabilizing. This technological and regulatory system prevents access to information that could incite political resistance or reveal state secrets. Popular international social media, news, and streaming sites are blocked, creating an isolated Chinese cyberspace. These efforts aim to maintain government authority and control over information accessible to citizens.2