content: It's true in mainstream media, but China has so many web forums you can easily discuss Tiananmen crackdown if you want.  You also need to know that CCTV (China's state owned television) did broadcast Tank Man in China when the crackdown happened, it's not like there's zero exposure about him in China. If people deem his action are profound, they will discuss it more. But like I said, the photo is about a man blocking a column of tanks leaving the Square and told them to go back, what useful info can one infer from that? There are so many conflicting interpretations.