San Francisco - Quantcast, a provider of open Internet ratings for websites, widgets and videos, has raised $20 million in its second round of funding, led by Founders Fund and Polaris Venture Partners.

San Francisco-based Quantcast counts 20,000 publisher partners, including Fox, CBS, Belo and Slide, for its traffic and audience profiles for over 20 million Web destinations.

The free program uses tags to assess entire audiences, combining directly measured traffic statistics with multiple panel data sources to generate audience profiles.

"Today we provide accurate and detailed audience information for millions of web destinations and these new funds will be used to extend our leadership position and deliver enhanced services to our Quantified Publishers and the broader industry," said Quantcast co-founder and CEO Konrad Feldman.

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