Posting picture from iphone to facebook wall

I'm using Facebook Connect for iOS to post a picture, taken in an app, to facebook wall, possible using the local file URL, according to another post: adding photo on facebook wall

The URL appears to be pointing somewhere valid, but the picture doesn't show up. Verified that it does work with a web link. Anyone have an idea why this isn't working for local files? Would I need permissions beyond regular wall posts?

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According to facebook, any image posted to a stream has to be web accessible, so what I wanted to do just isn't possible. The only way to get this to work is to upload the picture somewhere first, then use that URL.

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If you want to get URL it's better to use ALAssetsLibrary method: writeImageToSavedPhotosAlbum:orientation:completionBlock:

It returns the a saved image URL in its callback block: ALAssetsLibraryWriteImageCompletionBlock. Should note that it's only available from iOS 4.0