https://www.facebook.com/notes/facebook-engineering/protecting-privacy-with-referrers/392382738919 https://www.facebook.com/notes/facebook-engineering/protecti.

https://www.facebook.com/notes/facebook-engineering/protecting-privacy-with-referrers/392382738919 https://www.facebook.com/notes/facebook-engineering/protecti... Facebook Engineering's entry on various methods of hiding referrers. This was 4 years ago, so some of these techniques might not still work.