Every time you surf a modern, advertising-supported website, you relinquish personal information to the site’s advertising partners. Your private information has real-world value for pretty much every company that buys ads online. Google collects some of that information to help you recover your account in case your security gets compromised. But the company also uses it to improve its services and to target ads more effectively. The free Privacyfix browser extension analyzes data stored in your browser. According to Privacyfix, I’m worth more than $600 a year to Google but less than 50 cents to Facebook.”]