Hacker News Reader

I like the idea, but I think the trust problem + shipping costs + challenge of finding overlapping swaps could be challenging. But this may be interesting for rare or expensive books With the "overlapping was" problem you may have to create a currency/credit system in which case you're almost a used book store.

Maybe have them take a photo of the specific page of the book? Like the one with the copyright and publishing info? At least then it’s some indication that they have the book.

You could scale up a bit using mTurk and the OCR to verify.

Maybe use a reputation score, because becoming rich stealing books is going to need a lot of books (especially as pocket books are very cheap), and so scammers would very quickly lose their stars.

http://bookmooch.com/ uses a points system

Sorry, link seems to be broken.

https://www.swapiverse.com