Quantcast is an American know-how company, based in 2006, that makes a speciality of viewers measurement and real-time advertising. The company provides public access to traffic and demographic information for hundreds of thousands of Web sites and detailed consumer insights to digital publishers enrolled in its Quantified Publisher Program. Their knowledge centers course clickadu review for advertisers of greater than 800,000 transactions per second and the company states that it produces correct viewers measurement to over one hundred million web locations. As of 2013, it was stated to be one of the world’s top 5 big information processing organisations. Website with the highest mixture of pageviews and unique visitors are being ranked as number one.