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Nielsen launches Four-Screen Ad Deduplication, its methodology which will be used for YouTube 

3 minute read | July 2022

Media buyers can now compare YouTube reach from computer, mobile and CTV to linear TV, a foundational step toward achieving Nielsen ONE

NEW YORK (July 21, 2022) — In a landmark move that will allow media buyers to compare YouTube reach to linear TV, Nielsen (NYSE: NLSN) is expanding its cross-platform measurement of YouTube across computer, mobile and connected TV devices to more accurately compare audiences to linear TV, giving media buyers greater comparability than ever before. Nielsen Four-Screen Ad Deduplication methodology enables media buyers to more clearly understand and better compare YouTube reach inclusive of connected TV (CTV) to linear TV ad buys. First available in Nielsen Total Ad Ratings, Nielsen Four-Screen Ad Deduplication will be foundational to deduplicate audiences across devices, services and platforms in Nielsen ONE, the company’s forthcoming cross-media measurement platform designed to deliver comparable metrics across screens and various stages of the media lifecycle.

With this announcement, Nielsen adds CTV to existing computer, mobile and linear TV deduplication to its Total Ad Ratings product to help media buyers more accurately measure the fourth screen by delineating linear television and CTV inventory. This is noteworthy becauseYouTube accounts for over 50% of ad-supported streaming watch time on connected TVs among people aged 18+ in the U.S., according to Nielsen Streaming Platform Ratings. 

Nielsen Four-Screen Ad Deduplication for YouTube gives advertisers and agencies a comprehensive view of an entire campaign to better understand reach, manage frequency and verify the audiences of their media buys. 

“In a converged world, customers need a complete picture of their ad spend across all screens,” says Debbie Weinstein, Vice President, Global Advertiser Solutions, Google & YouTube. “Nielsen enabling advertisers to compare YouTube’s reach across mobile, desktop and now CTV to TV is a tremendous step towards their vision for Nielsen One, and we look forward to their continued efforts to bring cross media measurement to the industry.”

“Four-screen measurement is a critical step toward Nielsen ONE, as it provides the comparability necessary to produce a trusted, deduplicated number across platforms that enables clients to better understand reach, manage frequency and verify the audiences of their media buys,” said Kim Gilberti, Senior Vice President, Product Management, Nielsen. “As consumer engagement across platforms continues to converge, digital measurement must provide continuous and comparable metrics across all channels.” 

Four-Screen Ad Deduplication represents another significant milestone for Nielsen on its path to launch Nielsen ONE, as it is one step closer to producing a deduplicated total audience number that will enable clients to compare reach metrics across their full portfolio of assets. While Four-Screen Ad Deduplication will make its debut in TAR, it will ultimately power Nielsen ONE.  

This builds on a number of industry-leading comparability enhancements made by Nielsen including the anticipated launch of Individual Commercial Metrics which enables linear TV to be measured at a sub-minute level similar to digital. 

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Nielsen shapes the world’s media and content as a global leader in audience measurement, data and analytics. Through our understanding of people and their behaviors across all channels and platforms, we empower our clients with independent and actionable intelligence so they can connect and engage with their audiences—now and into the future.

An S&P 500 company, Nielsen (NYSE: NLSN) operates around the world in more than 55 countries. Learn more at or and connect with us on social media.


Dawn Rowan