What does the universal wall mean?

In some specific times or language environments, there will be some online buzzwords, which will be frequently used at a certain time, and many online buzzwords can also reflect people's attitude towards life. So what does the universal wall mean? The Universal Wall is actually a WeChat or QQ account, which contains many students from schools and has a wide network of contacts. As WeChat official account, it is a bridge between classmates. Universal walls are common in universities. Basically every school will have a universal wall. There are many people in the Universal Wall. Some students in the performance department can find the Universal Wall to promote their products, or the clubs in the school will find the Universal Wall to promote their clubs.