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Are they using this SDK in the Facebook iOS app? If so the ratings don't speak too highly of the SDK. If not why not?

I recently wrote a blog post about the Facebook iOS app that may answer some of your question: http://www.cocoacontrols.com/posts/2012/07/06/a-primer-on-hy...

As for the rest of it, I'm guessing the answer is "maybe, but not in the currently available version of Facebook for iOS."

Main issues with Facebook iOS app are network related in my experience, especially since much of it is just a web view.

Facebook website in Mobile Safari is very close to iOS app today.