There were plenty of stats doled out by Twitter's founders during Chirp Conference keynotes today. The two that stuck with us were: 1) that its servers handle 3 billion calls every day, just to the API, and 2) that 75% of all their traffic comes from their API. If you look at the volume alone, that's over 30,000 updates, timeline requests and searches per second. That's a massive API.
WhatsOnMyBookshelf is an online book trading application that makes it possible for users to exchange books using a simple point system. For avid readers who have rapidly growing collections of books they've already read, this is a clever little app to help them get their hands on new reads without having to spend any actual cash. WhatsOnMyBookshelf also provides the WhatsOnMyBookshelf API that provides access to this functionality.