How 105 Companies are Tracking Me on the Web

This morning, if you opened your browser and went to NYTimes.com, an amazing thing happened in the milliseconds between your click and when the news about North Korea and James Murdoch appeared on your screen. Data from this single visit was sent to 10 different companies, including Microsoft and Google subsidiaries, a gaggle of traffic-logging sites, and other, smaller ad firms. Nearly instantaneously, these companies can log your visit, place ads tailored for your eyes specifically, and add to the ever-growing online file about you. There's nothing necessarily sinister about this subterranean data exchange: this is, after all, the advertising ecosystem that supports free online content.

All the data lets advertisers tune their ads, and the rest of the information logging lets them measure how well things are actually working. And I do not mean to pick on The New York Times. While visiting the Huffington Post or The Atlantic or Business Insider, the same process happens to a greater or lesser degree. Every move you make on the Internet is worth some tiny amount to someone, and a panoply of companies want to make sure that no step along your Internet journey goes unmonetized. Even if you're generally familiar with the idea of data collection for targeted advertising, the number and variety of these data collectors will probably astonish you. Allow me to introduce the list of companies that tracked my movements on the Internet in one recent 36-hour period of standard web surfing. My complete list includes 105 companies, and there are dozens more than that in existence. You, too, could compile your own list using Mozilla's tool, Collusion, which records the companies that are capturing data about you, or more precisely, your digital self.