What does "c-expansion" mean?

List refers to QQ list.

Expansion means expansion and increase. Adding friends means expanding the list.

To put it simply, I asked if you could add friends.

For example, if I want to add you as a friend, I will say "to expand the list".

The single word "expansion" also means expanding space (that is, forwarding).

For example, "say first and then expand" is the first article that lets you forward his space.