This site is powered by Drupal for Facebook.
The page you see here is also visible in a facebook application.
I'm creating a content form and I'd like to convert in a Facebook app. Is it possible create only this content in Facebook as an app without the rest of Drupal site?
Its possible, but it really helps to know your way around drupal.
Because canvas pages can use a different theme from your regular site, you can hide all the normal navigation links, menus etc. With drupal's permissions, you might be able to allow facebook users to see only a portion of the site. And with some snippets of code in a custom module you'd really be able to fine tune it.