“the way you target audiences is by actually crafting the the targeting into the into the ad itself and facebook still has like first party data on engagement on the ad and click-through rate and view rate that shows them oh yeah they said it looks like these people like it”

Post-ATT: Creative IS the Targeting — Facebook Reads Engagement Signals on the Ad Itself

After ATT removed third-party audience signals, Facebook shifted to using first-party engagement data on the ad itself — view rate, CTR, completion rate — to infer which audience segments the ad resonates with. The practical implication: demographic and interest targeting matter less; the creative must encode the targeting. A fitness-for-seniors ad does not need an age-targeting layer if the creative itself filters the right audience.