Facebook application allows you to add new ways for users to interact with each other using Facebook. Facebook application written in server-side language, and hosted on your own server application developers. They interface with Facebook, so that they appear to the user to be part of Facebook itself. This book shows PHP developers how to quickly get started building powerful applications for, how to work with data stored on Facebook, including photos, and how to handle multimedia and other custom data within Facebook applications. This book covers how to send notifications and invitations from within the application, update user profiles, applications make the control panel for users, and much more. What you will learn from this book? Learn for application development through a step-by-step examples.Build applications for data-driven, working with friends list, photo gallery, multimedia, and more.Work with security model for applications to produce a safe and functional.Communicate with users through newsfeeds, notifications, invitations, and messages.Learn is for the PHP API, and various markup languages you need to build applications for Facebook: Mock Ajax, FBML, FBJS (a variant of JavaScript, especially for), and FQL. Approach This book is based on your knowledge as a PHP developer to provide, quick step-by-step tutorials on building Facebook applications. Along the way we provide quick reference to the most important aspect of the API, so you can refer back as you develop your own applications with the book. Who is this book written for? This book is for PHP5 developers who want to create custom applications can.