Crear la app en
https://developers.facebook.com
Completar el “Page Tab Name” y el “Page Tab URL” en el panel llamado “Select how your app integrates with Facebook“
Adding an App to a Page
Facebook Page administrators can add your app directly to their Page by navigating to the following URL: https://www.facebook.com/dialog/pagetab?app_id=YOUR_APP_ID&next=YOUR_URL, where YOUR_APP_ID and YOUR_URL can be found in your app settings.
VER: https://developers.facebook.com/docs/appsonfacebook/pagetabs/
Un dato clave para evitar los scrolls en el tab
http://www.hyperarts.com/blog/facebook-iframe-apps-getting-rid-of-scrollbars/
