I currently operate a site which uses the Facebook Connect for log-in. I would like to "convert" this site to a facebook appliation (that is, to be used as an iframe in Facebook website). What will be the best way to do so? What changes do I need to make in the log-in procedure to enable it? Is there anyway I can use the same URL of my site to be served as the facebook app, and in that way avoid duplication of content (one for the website version and the other one for the app)?