How to delete the text in a permanently enclosed space?

Recently, I often see some people talking about thousands of words, and I am puzzled. I just found out, but it's actually very simple. The first step is to open a "mobile phone friend" in QQ, that is, a "friend" connection under the space. Originally called QQ alumni. Step 2, in the talk settings, synchronize the talk of Tencent friends in the display space. You should understand here. The third step, now talk about it among QQ friends. Send as many as you want, regardless of the number of words.

If the space is closed, there is no need to delete it. Oh, you can also delete it slowly.