Where I think the Facebook thing might get interesting is the Ads on the pages. I don't think I'd run any, but that's what I'd be interested to hear feedback about.
But I don't think someone having success with it would be very wise if they shared much at all about that kind of success. They advertise to pull work. And sharing their technique does the opposite.
So I've generally been under the assumption that when stuff is shared about advertising success, its sort of a cover, but does not reveal the big picture.