I have looked at the facebook iphone api and watched the tutorial they offer but an not sure if one needs to have a facebook app as well to be able to connect an iphone app to facebook.
I would like to allow my users to be able to share things on their profile. e.g. set their status from within my iphone app.
How is this done?
Try the Facebook iPhone SDK
–edit–
You need to register your application to use the API.
Authentication Docs