First-party hygiene: Facebook shows users when a Custom Audience list was uploaded
The change means advertisers need to be extra vigilant about keeping their first-party lists updated. Previously, users could see ad targeting information such as demographic details, interests, websites they had visited and if they were part of a Custom Audience list. With this latest update, the “Why am I seeing this ad?” notification goes beyond simply letting a user know if they are on a list uploaded by an advertiser, providing a specific date when the Custom Audience list was uploaded and
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