More than 90 per cent of pornography sites leak data on people browsing them to third party companies including Google and Facebook
Source:
https://www.newscientist.com/article/2210599-thousands-of-pornography-sites-leak-data-to-google-and-facebook/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home