Wired News describes the Web measurement market. Both Nielsen/NetRatings and comScore employ panels of web surfers - in Nielsen's case, about 37,000 people; comScore, 1.5 million - who allow the companies to install monitoring software on their computers to track the websites they visit. There are also incentives: Nielsen promises $50 a year to home users ($100 if you consent to do it at work), while comScore offers free virus protection, an internet accelerator program to speed up dialup connections, and even sweepstakes prizes.
Security
Controversial surveillance firm pitches plan to tackle New York City traffic
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