PHP 5.2 or higher versions.
You will need a Facebook API key pair to link your Drupal site to Facebook (FB).
NOTE: If you do not already have a Facebook account, you will first need to create one.
Each website you wish to provide FBConnect for needs its own corresponding FB application setting up.
Select 'Set up New Application' button from the top right.
The first step is to assign a meaningful name to your new FB application and agree to the terms of service.
If the name is accepted you will then move on to the 'Basic' settings for your application.
The 'Basic' form will provide you with a unique Application ID, and an API key plus Secret key. The keys look something like '4828b5c45b0bac64b5378b0500b3ab7e'
Complete the rest of the 'Basic' form - adding a description and logo image as required. These will be shown to the user when they click the FBConnect button on your Drupal site.
Click on the "Authentication" tab down the left of the form and set the following values:
Post-Authorise Callback URL: Paste in the following URL http://example.com/sites/all/modules/fbconnect/xd_receiver.html then replace example.com with the address for your Drupal site.