ReadItSwapIt (RISI) was a book exchange website co-founded in 2005 by Andrew Bathgate and Neil Ferguson of London, UK. And closed in Sept 2017. It facilitated direct swapping of books among its members in the UK.
Operation ReadItSwapIt operated a "direct swap" method of exchange, where a single book belonging to one member was exchanged for a single book belonging to another member. This is contrast to other book swap sites, which offer a credit-based system of exchange.
References Fresco, Adam (2 January 2006). "Chapter and verse of online book swaps". The Times
External links ReadItSwapIt in The Times online (behind pay wall)