Friendship books (fb for short) are traded by many penpallers. They are small handmade booklets that are passed from person to person, each adding his/her name and address ( many times by label ). Most people add information about themselves such as age, interests, hobbies, etc. Some write that they would like new new pen pals. Some add stickers or other types of decorations. When the book is full it is mailed back to the person it was created for. Fb's are started as a way to thank a pal, to look for new pals, and for collecting. It is very interesting to get a full fb back because you get to see all the places, they have been .... through many states and countries. The designs of fb's are full of variety. Some are very simple; others are complex art projects. I have seen people make them out of scrap paper. Others neatly cut fancy paper and emboss it with rubber stamps. There are no limits to the designs people make. You do not have to sign fb's if you dont want to, just pass it along to some one else. FB's require patience; they can take years to fill (especially large ones ). It is best not to make fb's too large because you dont want to pay too much for postage and have a hard time fitting them into envelopes.
Friendship Sheets are just like FB's, but instead of a booklet format they are just one sheet of paper.
Slams are similar to FB's. The first page(s) is the sign in page. This is where you write in your name and address or stick your label, usually next to a number. On each of the following pages is a question. Under the question all signers add their answer nex to their number. Some common questions are: "what is your favourite movie?"; "would you like more pals?";"name your favourite TV show?".
Crams are fb's on a smaller scale. The point is to cram many addresses on to a small peice of paper. You do not write information about yourself or anything that will take up space. Many are for address labels only.