Please find below the peer presentation that goes over Nielsen, ComScore Quantcast and Alexa. The presentation and discussion touched on differentiators, and challenges and benefits to each platform. There is a lot to think through when choosing which measurement tools that you will use when you launch your site.
Please find the powerpoint deck from class one, 1/13/10 here:
Link to download the Class Presentation – Course Overview / History of the Internet
Video #1, History of the Internet
Video #2, Social Media Revolution