Thanks SO much for the review, and for pointing out that this is really, really hard to do. It's not an easy panacea that you can just throw out there.
You have some excellent questions here, but remember, this is 60 Minutes where most of the audience has no idea what Facebook is. The fact that 60 Minutes even did the story, and the level of detail they went into for a mainstream audience, is what's "groundbreaking" for me.
Besides, what did you really expect Mark to say? In repeated public appearances, he and the company reveal very little. So yes, kudos to Brandee and her team. It's a real coup for Facebook.