In iOS 6, tapping the action button in the Photos app presents the standard UIActivityViewController:

Doing the same from Messages presents a different set of options. This looks to me like it’s using the UIDocumentInteractionController api to pull all the apps that say they can handle an image.

My question is twofold:
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How does one get into the Messages action menu? Tumblr and Halftone, to name a few, have done it… I can’t seem to find the documentation.
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How does one show the Messages-style action menu? When I present a UIActivityViewController it doesn’t have those options… just the standard set facebook/twitter/copy/print/save to camera roll/etc.
Thanks!
How to get on that list: “Registering the File Types Your App Supports”
To handle images, you probably want to register for
public.image(Reference)To present that list, you just need to ask a UIDocumentInteractionController to display its options menu