Wikipedia
PaperBackSwap
PaperBackSwap (PBS) is a club co-founded in 2004 by Richard Pickering and Robert Swarthout of Suwanee and Rome, Georgia, (USA). Swarthout later left the company to pursue other ventures. The purpose of PaperBackSwap is to use the Internet to facilitate the parity trading of books (or " book swapping") among member bibliophiles in the United States. The club also operates sister websites Swap-a-DVD and Swap-a-CD to facilitate parity trading of DVDs and CDs, respectively.