AppTrackingTransparency

Twitter 2021-04 technology active Updated 2026-02-21
Early 2020s Major 150 million+ lifetime posts

First documented in April 2021 on Twitter. Currently active and in regular use across social platforms since 2021.

Also known as: ATTiOS 14.5Ask App Not to Track

App Tracking Transparency (iOS 14.5, April 2021) required apps to ask permission before tracking users across other apps/websites. Facebook ran attack ads claiming it would “hurt small businesses,” really meaning Facebook’s ad targeting. 96% of users opted out, costing Meta billions and forcing ad industry adaptation. Landmark privacy win showing consumers value privacy when given choice.

Sources: iOS ATT Opt-Out Rates, Meta Revenue Impact Reports

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