Source: WinXPnews February 27, 2006 Newsletter
Note: Below is copied directly from the newsletter. Yahoo certainly doesn’t make it easy to escape their “Web Beacons”.
We’ve had a few questions lately about Yahoo’s use of Web beacons, which track Yahoo Groups’ users website visits. This is stated on their Privacy Policy page, in the “Cookies” section. Web beacons are small electronic files that are used to count and recognize users for purposes such as personalizing your pages and conducting research.
You can opt out of other companies’ cookies by going to the Privacy Policy page at Yahoo! Privacy Center Web Beacons and clicking Cookies in the left column. Scroll down to “Other Companies’ Cookies on Yahoo!” and click “Other companies” under that. Then scroll to the third paragraph and click “web beacon.”
Scroll down to “Outside the Yahoo! Network” and in the final paragraph, click “click here.” Note that this opt-out action is not user specific but machine specific, so you’ll need to do this on every computer you use.