My entry about slum note is still the most popular (that is, most read) post to date. I never expected it, however, I could still recall how slum notes have become so popular back then, especially in high school. Almost every girls have their own slum notes (others call it slum book), or at least, some have already signed one.
The usual slum note was recycled, or improvised version of the classic spring notebook. The first to sign is of course the owner, then she (or some, "he") will let her close friends sign first. It's the trend. It's like before you let other people sign into your slum note, they should have an idea first about you.