Let us get straight to it. This tutorial explains how you can develop a basic facebook application using Facebook Open Graph API and PHP SDK. Weve also given a sample application code written in PHP using facebook API Hi, In this post I will be discussing about Graph API. The most basic use of it is when you want the users to register in your website via their Facebook profile. The advantage of doing that is, it saves all the email authentication, captcha etc validations. To create Facebook application follow instruction on my previous post How to Login with Facebook Graph API in PHP.huzoorbux.