According to a new report by MediaMind, conventional audience measurement metrics that do not adjust for user cookie deletion overestimate the number of unique users by up to threefold. MediaMind’s method of measurement, the adjusted unique, divides the number of total impressions by the average frequency of cookie deletion. The study was based on 26 billion impressions served in the U.S. and Europe from January to December 2010.

More in Media
In Graphic Detail: The real impact of creators at the World Cup
The 2026 World Cup buzz was all about creators; we look at the numbers breaking down their impact at the global tournament.
Media Briefing: Brand authority and trust are becoming publishers’ newest AI assets
Some publishers are betting that trusted brands and editorial authority are becoming their biggest competitive advantage with LLMs.
Albertsons’ new ‘micro sitcom’ is a big deal for retail media
Albertsons Media Collective has launched its first episodic, scripted branded-entertainment campaign in partnership with Procter & Gamble.