When Tim Cook published an open letter in September to address iCloud privacy and security concerns, he said free online services treat you, the consumers, as product. Even newcomer Ello, which is dubbed the anti-Facebook, has a manifesto that ends with: "You are not a product." Well, those sharp words have found their mark in Zuckerberg (pun totally intended), and it sounds like they hit him where it hurts -- so much so that he's just unleashed some biting commentary of his own, despite previously declaring his respect for Cook as a leader. In an interview with Time magazine about his plans to get the world online with Internet.org, the social media mogul irritably defended Facebook's free / ad-supported model, against what he sees as charges that an advertising business model is fundamentally misaligned with customer's interests. The way he sees it, if Apple were truly aligned with customers then it would charge less for all of those iThings it's selling.