Amit Agarwal writes that Yahoo apparently uses Web Beacons and cookies to track youÃ¢â‚¬â„¢re surfing habbits and then show ads or whatever accordingly.
WhatÃ¢â‚¬â„¢s web beacon? Wikipedia defines web beacons as invisible objects that are embedded within email or web page to the user, but allows checking that a user has viewed the page or e-mail.
Thesedays, web users are getting more and more concerned towards privacy, especially after the AOL privacy leak. Luckily Yahoo allows you to opt-out of this by simple clicking this link. This way, you could stop Yahoo from spying on you.
Similarly, Google uses a cookie that expires in 2038 (perhaps, infinitely). This cookie contains a unique address which could identify and track down users between their sessions and preference. Deleting the cookie isnÃ¢â‚¬â„¢t a solution because it re-appears and assigns you a new address. The only two ways to protect youÃ¢â‚¬â„¢re privacy is to use proxy or annoymizing that cookie. Drag Anonymize me bookmarklet to your toolbar and go to google.com (like always), click on the bookmarklet, click OK again and save the preference. By doing this, youÃ¢â‚¬â„¢ll be having the same cookie as many others do, so nothing to worry about the privacy.