Facebook Application Development: A Step-by-step Guide to Creating an Application

This tutorial describes how to create a platform application that you can use as a template when creating your own platform app.
Contents of this tutorial:
- Introduction
- Integrating Hello World
- Pushing FBML to the profile box
- Using mock-AJAX in the profile box
- Using MySQL to create a counter
- Putting the examples together
- Some files to downloads
Read […]

Facebook Platform or where to start on the developers part of Facebook

On this page (http://developers.facebook.com) you will find:
- The complete details documentation on the Facebook Platform and ow it works from the inside out.
- Resources on code samples, client libraries, and more , to learn more about the Facebook Platform.
- Tools to prototype you Facebook Platform application in real-time with easy-to-use-test consoles.
- And the latest news […]

Facebook Methods description: friends.areFriends

Returns whether or not each pair of specified users is friends with each other. The first array specifies one half of each pair, the second array the other half; therefore, they must be of equal size.