Researchers at Microsoft, Carnegie Mellon University and the University of Pennsylvania analyzed 22,484 porn sites and found that 93% leak user data to a third party. Normally, for extra protection when surfing the web, a user might turn to incognito mode. But, the researchers said, incognito mode only ensures that your browsing history is not stored on your computer. CNET reports: According to a study released Monday, Google was the No. 1 third-party company. The research found that Google, or one of its subsidiaries like the advertising platform DoubleClick, had trackers on 74% of the pornography sites examined. Facebook had trackers on 10% of the sites. "In the U.S., many advertising and video hosting platforms forbid 'adult' content. For example, Google's YouTube is the largest video host in the world, but does not allow pornography," the researchers wrote. "However, Google has no policies forbidding websites from using their code hosting (Google APIs) or audience measurement tools (Google Analytics). Thus, Google refuses to host porn, but has no limits on observing the porn consumption of users, often without their knowledge."