Check out this guide for facebook on iphone
EDIT: Well, about the list, I think it would be better if you save it on a user device (or, preferably, in a remote database), because tracking user comments specific to your application via facebook is too cumbersome (I'm not familiar with an FB API that returns a list of comments for a specific application, so also check this)
Posting to the Users Wall is easily and clearly explained here (Goto "Publishing to the Users Wall" somewhere in the middle of the page),
giorashc
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