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Apple’s 2021 App Tracking Transparency shock revealed Meta’s measurement dependence on mobile IDs

Dated 26 April 2021: Apple’s 2021 App Tracking Transparency shock revealed Meta’s measurement dependence on mobile IDs. In the causal graph this event strengthens the driver Social-Platform Dependence.

Who was responsible

Contribution type and responsibility level for each recorded actor — not sole-author shorthand.

No public contributors are listed for this fact.

What changed

Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.

    1. FactApple’s 2021 App Tracking Transparency shock revealed Meta’s measurement dependence on mobile IDs
    2. strengthensDriverSocial-Platform Dependence

    provisional weight · verified

Causal path

How this event connects to drivers and indicators in the graph.

  1. FactApple’s 2021 App Tracking Transparency shock revealed Meta’s measurement dependence on mobile IDs
  2. strengthensDriverSocial-Platform Dependence

Cite this page

Factrail. (2026). Apple’s 2021 App Tracking Transparency shock revealed Meta’s measurement dependence on mobile IDs. Factrail. https://factrail.ai/facts/apple-att-meta-ad-tracking-shock-2021

https://factrail.ai/facts/apple-att-meta-ad-tracking-shock-2021

Accessed 16 October 2026.

By the · Method: how we source and score · Last reviewed

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