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I wonder if people have thought about another variant of this. An app that maintains two address books and switches between them based on context.

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Or just some form of "share only these contacts with app X" option at the device system/OS level.

Given the tracking cookie situation, apps could refuse to install if that option is turned on. They can easily detect if they see a small number of contacts relative to average.

With the two address book solution, they should have no way of telling which one is the real address book.

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