2. Introduction to the origin of the War of Expedition to the North: Generally, you can see these contents in Sun Xiaochuan's comments on Weibo, that is, gathering people to make up jokes with the theme of regional stereotypes. Also known as the link or region of the expedition to the north. Usually, a netizen begins with a comment on "Fighting against the North", and others write jokes in this comment by Gai Lou. Although these contents are mostly based on the geographical discrimination and cultural differences between the north and the south, the tone is strange and the content is also very harmful, but the editors usually do not have real malice, but are more similar to banter and self-mockery, and there are few interactive contents in the building. A series of special geographical names have emerged in this link, such as Dongbai (Northeast) and Shadong (Shandong). A classic joke about the war between the south and the north: Henan people only drink lattes when drinking coffee.