Some trackers , like those for Google Analytics, provide mundane traffic data to the site. In exchange, these third-party companies receive data from the website’s visitors. Facebook and Google denied that potential information collected by their trackers on pornography websites was used for creating marketing profiles intended to advertise to individuals. The spokesman suggested that when alerted to new sex websites using the tools, the company will enforce against them. And when it comes to pornography websites, the most basic browsing data is intensely personal because it is revealing.

Source: New York Times July 17, 2019 23:26 UTC