Stale Cookies: How companies are tracking you online today

"“There’s a Whac-A-Mole game that’s started in earnest,” said Aleecia McDonald, director of privacy at Stanford’s Center for Internet & Society."

"One aim of the Cookie Clearinghouse initiative at Stanford is to provide tools that prevent a company like Facebook from following users around the Web just because they chose to log into the social network, privacy researcher Jonathan Mayer pointed out."