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About Our Data: Quantcast has built powerful statistical technology to help you best understand and reach digital media audiences. Our tools enable the direct-measurement of traffic and audience characteristics, empowering both publishers and marketers to operate in a more connected and transparent way throughout strategy, buying, selling and evaluation phases of a campaign.
"People Versus Cookies
Quantcast provides audience data for both unique cookies counts and people. The Quantcast statistical direct measurement model takes into account numerous factors to build a translation of cookies to people that is unique to each digital media property."