Ghostery.com

 

This is an excellent addon for Firefox, Chrome or IE.

From the site: Ghostery sees the invisible web - tags, web bugs, pixels and beacons. Ghostery tracks the trackers and gives you a roll-call of the ad networks, behavioral data providers, web publishers, and other companies interested in your activity.

 

http://www.ghostery.com/

I found out about it on Steve Gibson’s Security Now Netcast:

http://www.grc.com/securitynow.htm

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