I'm a bit disappointed about this book. It should cover everything about the development of a Facebook application but, IMHO, it fails on all the track.
The book is divided in two main section, in the first one the author tries to describe how to write a FB application. The idea behind the application is not very innovative but is good as a starting point and it cover some of the most used FB features.
The real problem is that all the code used for the examples is very ugly, difficult to be understand, and with a lot of not-so good programming practice.
The second part of the book is a simple reference, copied from the FB reference and not always clear as the original one.
So, if you are skilled in PHP and, you want to write some FB apps read the online Facebook wiki and knowledge base. Those will help for real....Continua