I'll keep this short but sweet: when you click on the links below the fold you'll realize just how prescient George Orwell was.
"Falun Gong" on Google US:
http://images.google.com/... (caution, semi-graphic)
"Falun Gong" on Google China: http://images.google.cn/... (Pictures look innocent? Try clicking on the links and reading the stories)
"tiananmen" on Google US: http://images.google.com/...
"tiananmen" on Google China: http://images.google.cn/...
Not much needs to be added; I think this is pretty much the doubleplusgood description.