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Quantcast, a San Francisco based web analytics firm has raised $5.7 Million from The Founder´s Fund and Revolution Ventures in Series A Funding.

Quantcast is a free service that allows publishers to get demographic data on their readers. Quantcast estimates the gender, age, household income audience composition, share of visits, estimated monthly unique visitors and other such statistics. All this data is then funneled into the company´s “Mass Inference” algorithm to compute the likely demography of the site.

Other such services include comScore, Hitwise, Alexa and Compete.