Apple tries to stop developers sharing data on users’ friends

Apple changed its App Store rules last week to limit how developers use information about iPhone owners’ friends and other contacts, quietly closing a loophole that let app makers store and share data without people’s consent.

The move cracks down on a practice that’s been employed for years. Developers ask users for access to their phone contacts, then use it for marketing and sometimes share or sell the information — without permission from the people in those digital address books. On both Apple’s iOS and Google’s Android, the tactic is sometimes used to juice growth and make money.