Quantcast operates: Quantcast, Quantcast Notice
"Quantcast measures and organizes the world's audiences in real-time so advertisers can buy, sell and connect with the people who matter most to them. Used by the top 10 media agencies, the world's largest brands and more than half of the top advertising supported publishers, Quantcast connects the planning, buying, and media fulfillment processes, delivering the marketplace's most consistent and accountable audiences."
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