As I am writting my thesis I found this nice video from the comScore Media Metrix, which is a global leader in measuring the digital world and the preferred source of digital marketing intelligence.

comScore provides syndicated and custom solutions in online audience measurement, e-commerce, advertising, search, video and mobile and offers dedicated analysts with digital marketing and vertical-specific industry expertise. Advertising agencies, publishers, marketers and financial analysts turn to comScore for the industry-leading solutions needed to craft successful digital, marketing, sales, product development and trading strategies.