WINNING: Facebook warns Apple’s iOS 14 could shave more than 50% from Audience Network revenue. “Today, advertisers can use a unique device ID number called the IDFA to better target ads and estimate their effectiveness. In iOS 14, each app that wants to use these identifiers will ask users to opt in to tracking when the app is first launched. Facebook said its apps will not collect IDFA information on iOS 14.”

To be clear, Facebook is losing the ability to target ads to iPhone and iPad users when they’re using apps other than Facebook.

It’s impossible to prevent an app from collecting whatever data you input into it, but cross-app tracking has always felt devious and creepy to me.