Not sure what I think about this. BookCrossing is a way of sharing your books by releasing them so that someone else can pick them up and enjoy then too.

You print a label and stick it in the front of the book, then leave the book where someone else will pick it up. They then go to the BookCrossing website and record the fact that they have the book. Then in theory on it goes again. They’ve been at it since 2001 and claim that there are currently 1,769,999 BookCrossers and 12,047,263 books travelling throughout 132 countries.

There’s a tab at their site called Book Map which appears to notify us of releases and captures as they happen. It seems to be active in Europe. Apparently nothing ever gets done anywhere else, which is odd because 29% of their members are in USA.