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The impending rollout of Apple’s iOS 14 will bring big changes to Facebook, most notably the end of collecting iPhone identifiers (IDFA), and the social network is warning advertisers to expect weaker ad performance as a result.
By pausing IDFA collection, Facebook will effectively halt serving personalized in-app ads to iPhone users once they upgrade to iOS 14, an update that is expected as soon as next month and likely to have far-reaching implications for the industry.