I downloaded the app and it immediately asks you to start scanning barcodes for things you want or have. I selected "want" just to see if other people have some stuff I might have. I grabbed the closest thing to me that had a barcode which happened to be Alice Waters' In The Green Kitchen book. I scanned the code and the app told me no one had this book to swap. So I grabbed the next nearest thing that I thought more people would have, which was the Scream 3 DVD (yes, I'm watching all the movies again in preparation for Scream 4...). After scanning it told me 28 people have this DVD to swap. Clearly, this experiment shows that we're willing to get rid old campy horror DVDs, and not awesome green cookbooks. Good!