Have no fear, Zuckerberg is a poseur. And still a post-modern yuppy. It is all about him, nothing else. And it is being driven by some fancy chef in SF who planted the idea. Note that he does not actually raise any of the animals, simply buys them and slaughters them - all 3 of them by the article.
In the article he says he picks something to do for that year - learn Chinese, kill what he eats, whatever. Next year he will not do this and be on to something else. It is all about him.
Kudos for him learning what real food tastes like, but -1 million for being such a putz.