From Nakayosi magazine.

Fold accordion style (fold the second square under the first, fold the next under that, and so on). Then glue the back of each square to the one facing it OR, while folded, staple once through all squares along the top edge. There's one line each for name, phone number, and address. Two friends will fit in each square. The small size of this booklet makes it perfect for tucking into a mini-backpack or purse.