Quantcast, traffic measuring company, raises about $5.7M

Quantcast, a San Francisco start-up that measures the traffic on other sites, has raised around $5.7 million in Series A funding, according to a regulatory filing cited by PE Week. Investors included the Founders Fund and Revolution Capital, chief executive Konrad Feldman confirmed with VentureBeat several days ago, though at the time he did not confirm the amount.