You might be reading this and thinking the fuss over web cookies is overblown. After all, they are just small text files. They keep your login session alive and remember your shopping cart. They are helpful. So why did the media lose its mind?
The anger comes from two distinct sources. One is old. The other is new.
The Old Problem: Data Selling
Consumers have hated this for decades. Think about mail-order catalogs. You buy a drill. The company now has your name, address, and phone number. They also know you bought a drill.
They can sell that list. Telemarketers use it. Junk mail uses it. It is the fuel for invasive marketing.
The internet made this worse. A website tracks more than just purchases. It sees every page you read. Every ad you click. If you then buy something and type in your credit card info, that site knows far more than a catalog ever could. Targeting becomes precise. That precision feels like surveillance.
Most sites have privacy policies. HowStuffWorks, for example, does not sell your data. We do not share personal info with third parties unless you opt-in. We do aggregate data. If a reporter asks for visitor counts or popular pages, we build stats from the database. But the threat of sale is always there in the background.
The New Problem: Cross-Site Profiling
This is where the internet gets unique. Some infrastructure providers can create cookies that travel with you across multiple websites.
DoubleClick is the poster child for this. Many sites use DoubleClick to serve banner ads. DoubleClick places tiny 1×1 pixel GIF files on those sites. Those files allow DoubleClick to load cookies on your machine.
Now DoubleClick sees where you go. It sees the search strings you type into engines. This is not because of some evil code. It is because of how search engines implement their systems. But the result is the same.
DoubleClick builds cross-site profiling. It creates a rich profile of your behavior. The profile is anonymous. It has no name attached initially. But it is detailed.
Then DoubleClick bought another company. The threat emerged. They could link those anonymous profiles back to real names and addresses. They threatened to personalize the data. Then sell it.
That looked like spying. People panicked.
Individual sites cannot do this. Cookies are site-specific. A coffee shop website only knows about your time at its site. But DoubleClick serves ads everywhere. It sees the whole picture. That unique position is what caused the uproar.
Why It Matters Now
The internet infrastructure allows data collection that traditional mail order never could. You cannot track a customer’s journey from a hardware store to a bookstore using a catalog mailing list. The web can.
Privacy is not just about hiding your name. It is about controlling your digital footprint. When a third party tracks your movements across the web, you lose that control.
There are resources available if you want to dig deeper.
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More Great Links
- Netscape: Persistent Client State: HTTP Cookies
- Webopedia: Cookie
- CookieCentral: Cookie FAQ
- Netscape: Cookies – what they are and how they work
- Netscape: Privacy
