In the field of tracking and reporting on Internet traffic, there’s no more prominent name than comScore. It was founded in 1999 to track and report on ecommerce activity and, since then, it has diversified to track online advertising, socializing, searching, and much more. It’s now a publicly traded company, too, and its director of industry analysis is Andrew Lipsman, who tells us how it is that comScore knows all of that information. He joins Practical Ecommerce’s Kerry Murdock.