Every click you make, web cos are watching you

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: Afamous New Yorker cartoon from 1993 showed two dogs at a computer, with one saying to the other, “On the Internet, nobody knows you’re a dog.”

That may no longer be true.

A new analysis of online consumer data shows that large Web companies are learning more than ever before the gritty details of what people search for and do on the Internet, gathering clues about the tastes and preferences of a typical user several hundred times a month.

These companies use that information to predict what content and advertisers people most likely want to see. They can charge steep prices for carefully tailored ads because of their high response rates.

The analysis, conducted for The New York Times by the research firm comScore, provides what advertising executives say is the first broad estimate of the amount of consumer data transmitted to Internet companies every day.

Privacy advocates have previously sounded alarms about the practices of Internet companies and provided vague estimates about the volume of data they collect, but they did not provide comprehensive figures. The new analysis indicates that Web companies are, in effect, taking the trail of crumbs people leave behind as they move around the Internet, and then analysing them to anticipate people’s next steps. So anybody who searches for information on disparate topics like iron supplements, airlines, hotels and soft drinks may see ads for those products and services later on.

Consumers have not complained to any great extent about data collection online. But privacy experts say that is because the collection is invisible to them.