What does it mean to fight the North through the Internet?

What is the meaning of 1. network? It refers to a kind of entertainment with the theme of regional stereotypes and gathering people to make up jokes.

2. Introduction to the origin of the Northern Expedition: Generally, you can see these contents in the comments on Sun Xiaochuan Weibo, which are entertainment activities with the theme of gathering people to make up jokes and regional stereotypes. Also known as the link or area of northern exploration. Usually, a netizen begins with a comment "Against the North", and others write jokes in this comment by Gai Lou. Although these contents are mostly based on regional discrimination and cultural differences between the north and the south, with strange tone and harmful content, editors usually have no real malice, which is more similar to banter and self-mockery, and there is little interactive content in the building. A series of special place names appeared in this link, such as Dongbai (Northeast) and Dongsha (Shandong). A classic joke about the North-South War: Henan people only drink lattes when drinking coffee.