Enlarge / The two messages Facebook users will see in this test. On the left, Facebook's prompt, and on the right, the one required by Apple. (credit: CNBC)
Today, Facebook began testing prompts to iPhone and iPad users championing the importance of being tracked by the social network for the benefit of small businesses that use its advertising tools.
The test is in response to Apple's plan to require user opt-in to IDFA (ID for advertisers) tracking across all iOS, iPadOS, and tvOS apps starting with new software updates expected in the spring.
According to CNBC, Facebook will pre-empt Apple's required pop-up with its own on affected devices. Facebook's message is meant to persuade users not to opt out of tracking.
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source https://arstechnica.com/?p=1738701