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[$$] Apple’s New App-Privacy Rules Expose Past Loopholes

Apple Inc. is trying to enforce new privacy policies across its vast network of iPhone and iPad apps—and in the process is exposing longstanding gaps that left users’ data vulnerable to abuse. The company has issued new rules for app developers designed to limit future data collection and ad targeting. The rules thrust Apple into the role of regulator and enforcer in the wake of controversy over the misuse of personal data from Facebook Inc.—a scandal that has triggered calls for new federal regulations of digital information.