What does it mean to make a sofa in BBS?

The meaning of the first reply is that because everyone else is underneath, it is very comfortable to sit on, so it is called a sofa.

Your question is very interesting, upstairs is quite right. It can also be said to support the person who posted and support the post made. After all, sitting on the sofa is a kind of enjoyment, which means that seeing the post is a kind of enjoyment.

One reply is called a sofa, the second one is called a bench, and there is no more.

The first time I posted it was called sitting on the sofa.