Build Facebook Cross-Domain Communication Channel
The text below was copied from Enabling Communication Between Your Site and Facebook
Creating Cross-Domain Communication Channel File
- In the root of the Paperbook application (/ADF/apps/paperbook/) there is a file named xd.htm - copy this file into the root of your site.
Create a file named "xd.htm" and place it into the root of your site Note: The code in this file should look similar to this: