It's not troubling at all, this setting will be buried in the bowels of the privacy page. 1% of users will actually opt-out.
"There is going to be hundreds of millions of people who will never even know that they're recommending products to people, and that's bad."
Why? Exactly what is the moral outrage that when a person 'likes' Starbucks that that information is displayed to their friends? What did they think was going to happen?