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At the end of the video it shows a Apple app store graphic. So I would say its a native app.

At the end it says you can get it on Apple app store.

It's native. Zuckerberg has self-proclaimed Facebook to be "a mobile company."

My girlfriend found it frustrating that she can attach a picture to a facebook post in the browser (even on mobile) but can't in the app.

I can do that in the app (iOS) just fine... and not just on posts, comments too.

It's a native app. I haven't even heard of plans to make a web version.

those kind of animations wouldn't be so smooth on mobile devices, especially older ones.