Why can't you see what some friends have said?

You can't tell what some friends say. There is a simple reason. Either you set a space not to look at these people, or these people choose to block you when they speak. The reason for the former is simple. Maybe they usually send something about hydrology or promotion, so you block it.

The reason for the latter may be that I feel that there are some things that I don't want everyone to know and only need to be seen by some people. Nowadays, people pay great attention to privacy. Whether it is space or circle of friends, it is actually a small society. You have made a lot of money, and people know that you like the back of their hands.