How does doubleclick have demographic data for HN? I would love to be able to se...

rossriley · on Aug 23, 2012

They have tracking cookies installed on most user's machines.

This is because they have such a high penetration rate of advertising inventory which they use to profile you by age /sex / interests.

Then it's just a case of marking you as an HN user, they do this by detecting the referrer when you arrive at one of their sites.

abrahamsen · on Aug 23, 2012

Presuming it is the same as Google Ads:

dfc · on Aug 23, 2012

Presumin what? That page says I've opted out.

rmah · on Aug 23, 2012

Doubleclick is a part of Google.