What online marketers know about you

Andrew Garcia Philips and Sarah Slobin (plus five data gatherers) of The Wall Street Journal report on the prevalence of trackers and cookies on the fifty most popular U.S. websites:

Marketers are spying on Internet users — observing and remembering people’s clicks, and building and selling detailed dossiers of their activities and interests. The Wall Street Journal’s What They Know series documents the new, cutting-edge uses of this Internet-tracking technology. The Journal analyzed the tracking files installed on people’s computers by the 50 most popular U.S. websites, plus WSJ.com.

Websites (top half) and tracking companies (bottom half) are placed in the circular network diagram. Roll over a website, and lines flare out to the tracking companies that collect data about you on that site. Similarly, roll over a tracking company to see what sites they sit on. Lines are color-coded to indicate first-party tracker files and third-party ones.

Select a specific company for a more detailed breakdown and a brief explanation of the company’s privacy policy, what you can and cannot opt out of. For example, this is the view for Dictionary.com, which by far has the most trackers (234 of them total) out of the fifty sites.

There’s some clean, well-thought design and detailed reporting going on here by WSJ. You almost expect a piece this hefty to be clunky in the interaction, but everything works as expected. Take a look at the interactive (or the methodology) for yourself. There’s a lot going on and interesting tidbits to explore.

How do you feel about all these companies collecting data about you, what you’re browsing, and what you click on? I personally am okay with it – as long as it’s anonymized and improves my browsing experience (i.e. ads that are relevant to me).

5 Comments

Favorites

How to Spot Visualization Lies

Many charts don’t tell the truth. This is a simple guide to spotting them.

How You Will Die

So far we’ve seen when you will die and how other people tend to die. Now let’s put the two together to see how and when you will die, given your sex, race, and age.

Think Like a Statistician – Without the Math

I call myself a statistician, because, well, I’m a statistics graduate student. However, the most important things I’ve learned are less formal, but have proven extremely useful when working/playing with data.

Years You Have Left to Live, Probably

The individual data points of life are much less predictable than the average. Here’s a simulation that shows you how much time is left on the clock.