First, let's talk about what Facebook is. Baidu introduced it like this. "It is a metaphor for the formulaic tendency of shaping characters in literary and artistic creation, that is, it is clear at a glance what personality is good or bad." In fact, it is simply that some characters have been portrayed before they are written, so we can guess that this is Facebook!
In fact, the film was masked in the 1970s and 1980s, which was the early time of China film. The so-called "Gao Daquan" image, the hero must be tall, with a straight face, omnipotent, in order to reflect the image of the working class in the 1970s and 1980s. So when this character appeared, from his face, he knew that this was a hero.