http://www.lightcms.com/how-to-set-up-custom-facebook-page-tabs-with-content-your-clients-can-control

http://blog.intrapromote.com/adding-a-custom-tab-to-your-facebook-page/

  1. YOUR_APP_ID
  2. YOUR_URL

Here is the URL that holds the keys to the Facebook marketer’s kingdom:

https://www.facebook.com/dialog/pagetab?app_id=YOUR_APP_ID&display=popup&next=YOUR_URL