The book is a pretty slim volume, about 260 pages, but it’s an easy read too with plenty of screenshots.
Developer’s Guide to Social Programming
Building social context using Facebook, google friend connect, and the Twitter API
A bit of rest, a bit of CodeIgniter and a lot of JSON and APIs
Essential Facebook Development
Build Successful Applications for the Facebook Platform
Put your website on Facebook, or put a bit of Facebook on your site. This book shows you how.
Building OpenSocial Apps
A Field Guide to Working With the MySpace Platform
An In-Depth Look at Google’s OpenSocial Specification.