How Flash Cookies Threaten Your Privacy

Web sites are embedding bugs into your computer that track you even after you have cleared your browser's privacy settings.

These bugs are called Flash Cookies, or Local Shared Objects. Web sites use them to track you because they know that most people don't know about them and that they can track you even after you have cleared your privacy settings.

Web sites that use Flash cookies to bypass users' cookie privacy settings should be publicly flogged.

Why VistaPrint Is Creepy

UPDATE: It looks like might be done with Flash cookies - a technique of bypassing a browser user's "clear cookies" preferences. More about Flash cookies here:
"Bypassing user intent like this is scummy, plain & simple."

I agree with that statement.

I followed up this post with a page about Flash cookies.

(For a complete list of updates and comments, please scroll down.)

I went to buy some business cards on and noticed very weird behavior from the site.

Even though I had logged out, cleared cookies since my last visit to Vistaprint, my name would appear on the home page of the site whenever I visited it.

Here is a screenshot of the home page, with a key to the numbers:

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