What are /r/bookswap's favorite Products & Services?

From 3.5 billion Reddit comments

This sounds really cool but they have no system in place to deal with people who borrow books and don't return them (or who return them in bad condition).

Overall I trust http://www.bookcrossing.com or http://www.bookmooch.com because they're quite well-established but they do slightly different things! So, yes. :) Thank you for sharing, OP!