Recently, Apple released a seemingly innocuous software update: a new privacy feature that would explicitly ask iPhone users whether an app should be allowed to track them across other apps and sites.

For Facebook, however, this feature is anything but innocuous — it strikes at the heart of the company’s business model.

The dispute represents a further deterioration in the frosty relations between the two companies. What’s at the heart of this conflict, and why have the stakes become so high for both sides?

Guest: Mike Isaac, a technology correspondent for The New York Times.

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