Follow-up question: But that person can still watch it even if he doesn’t open the space? Answer: No need to enter his space. Just look at your own space and you can see the time when your friends updated their personal signatures. Question: The point is, that person didn’t open a space... I didn’t see the update in my personal center (on the computer). Answer: I can show. As soon as you enter your space, look at your homepage and scroll down to look for it. It's all showing on my side. Even if he has not opened a space, as long as he changes his personalized signature, it will be displayed in his friend's space. Think carefully. I won't be able to explain it for a while.