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Anyone who wishes to officially participate in "releasing" books, whether leaving it in a public place or passing it on to a friend, must register on the BookCrossing.com website, although there is the option to remain anonymous when "catching" or recording the find of a book. BookCrossing.com users can 'go hunting', where a member will go to the website to view a list of books that have recently been "released", then go to the location it was left to "catch" it. Books may also be left at Official BookCrossing Zones" (OBCZs), which are located in certain coffee shops, cafes, restaurants and other public places. The purpose of these locations is to get current members in the area to leave books to share with the public. This also advertises BookCrossing and creates more members.
Read more about this topic: BookCrossing