Competitive intelligence, Search intelligence for online advertising and search marketing - Hitwise

Each day, Hitwise provides insights on how 10 million US Internet users interact with more than 1 million websites, across 165+ industries.

Nielsen Online

Nielsen Online measures
and analyzes web audiences, advertising and commerce. What is your business challenge?

comScore, Inc.

comScore maintains massive proprietary databases that provide a continuous, real-time measurement of the myriad ways in which the Internet is used and the wide variety of activities that are occurring online.