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Re:Ask HN: Invited by Facebook for privacy roundtable. What ... by scarejunba on Tuesday July 09, 2019 @01:52PM (#20394654)
By making a Custom Audience and then selectively uploading? I think you have to agree to not do this.

The audience size tricks like uploading an audience, then adding one to it and reuploading won’t work. There’s a cardinality fudging thing.

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