In the world of penpalling, you will likely eventually run across friendship books. Perhaps a penpal will ask you: Do you swap FBs?
The friendship book is an interesting invention, for the penpal who is seeking new penpals and doesn't necessarily want to pay for them. I have penpals who only get new pals through FBs. I have included a picture of a FB cover above, but of course, there are varying degrees of creativity and quality in these FBs.
Inside the front cover of the FB, it says: FB made by (and lists the name of the creator) and for (and lists the name of the recipient). The by and for names can be the same.
The idea is, if you wish to have new penpals, you put a mailing label (or write your address) with a few interests and your bday or at least your age. Then you forward it to a penpal of yours. The point is the FB goes around the world and collects addresses. Once the FB is full, it is intended to be sent back to the "for" recipient listed in the cover.
I have filled out many a FB in my years of penpalling, but I don't recall ever receiving a letter to say: I saw your name/address in a FB and thought I'd write to you. I have, however, written many a letter to names I found in a FB and I have gotten spotty response.
The key thing to remember about the FB is the abbreviations.
Another important thing to remember about FBs is that they tend to take a long time to get back to the intended recipient. In fact, I sometimes wonder if they EVER do. Some people will write the month/year they sign the FB and I've had FBs that seem to have been circulating for 5-10 years. (It actually might make a good experiment to get a FB going and see how long it takes to come back to you.)
Even though they don't seem so effective, I do enjoy receiving FBs because it's a great way to learn of potential new penpals.
Keep Calm and Write On!