As part of the MRC audit, we’re sharing more details about our data sources and methodology. For our traffic measurement, Ad Planner uses a hybrid measurement methodology that combines direct-measured site traffic, through Google Analytics data that publishers have chosen to opt in to provide us, and sample aggregated data from Google products and services. We currently have over 10,000 sites that are contributing direct measured opt-in data to Ad Planner. Our sample data comes from a variety of sources including anonymized, aggregated Google Toolbar data from users who have opted in to enhanced features, opt-in anonymous Google Analytics data, opt-in external consumer panel data, and other third-party market research. All of this data is aggregated over millions of users and is powered by computer algorithms. The breadth and reliability of this aggregated data means that our traffic measurements are among the most accurate in the industry…

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