The Impact of Apple's iOS Update on Facebook Marketing

Starting in early 2021 Apple will begin showing Facebook and Instagram App users a privacy popup message allowing them to opt out of data tracking “across Apps and Websites owned by other companies.”

Facebook has begun warning advertisers about these changes to the Apple iOS 14, which they claim will "harm the growth of small businesses and the free internet". As people opt out, the concern is that advertisers may see a significant decrease in the number of reported conversions.

Facebook has published an article about How Apple's changes may limit marketing activity. Furthermore, this is the advice from Facebook on how to prepare event setup and management for these changes.