How to share an image from an iPhone application to facebook?
I am greatly appreciative of any guide or help.
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There is a Ray Wenderlech tutorial on how to use the new Facebook graph API.
http://www.raywenderlich.com/1488/how-to-use-facebooks-new-graph-api-from-your-iphone-app
Now once you have got the user giving you persmission, in your case it would be publish_stream. You can call the graph API with the parameters to post a photo on the wall.
You will need to dig into the developers help guide to find accurately the Graph api which meets your requirement. You will have to then use the accesstoken got from the first step to make the subsequent calls.