system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does Twitter censorship work? And how are governments involved?
gpt
Judging by Wikipedia, Twitter has the ability to limit messages based on geographic region. And apparently has a mechanism by which Twitter can be asked to hide messages.

Basically, if Twitter gets a legal order telling Twitter to hide things, they can comply. How the government is involved depends also on whether you consider the judiciary part of government.