Comment: Both Safari and Firefox allow you to block 3rd party

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In reply to comment: OP tells you how in the text. (see in situ)

Both Safari and Firefox allow you to block 3rd party

cookies.

I would presume Opera and Chrome do as well. I'd hope IE does, but I'm not certain.

At least doing that, you know that any cookies that get set come from the actual site you are visiting.

The other thing you can do is regularly clean out your cookies, or set them to expire or delete when you close your browser. This way, they can't track you later on.

But that is much more limited protection than a more robust blocker like Ghostery and some other add-ons.