> But what if you want to share a story? In Desktop, I’d right-click, copy the URL, and send it over. Metro News doesn’t have URLs. So I go to the right side of the screen and choose “Share.” I have two real options — I can send an email, share via Facebook, or share via Twitter. If I send an email, it generates a link that only people with Windows 8 can read.

This seems like a general problem with trying to share non-web content inside apps, regardless of the platform. If you're just putting an app wrapper around web content, like the Wikipedia app, you can provide a URL. But if your app does more than that you can't give them a web URL if there is no web implementation.