4 ms·

It's called re-targeting. You can use javascript to put users into a segment and re-target that segement; it's really easy. If you use the biggest ad-exchange

• stygiansonic 10y ago
  This is correct. Retargeting is one of the most valued aspects of adtech. Manufacturers website contains an iframe to the ad networks website. They signed up for this by placing JS snippet from the ad network on their site that created the iframe. This allows ad network to know that you've visited by placing cookie. Next time you visit site that shows ads from this network they can inspect cookie and show you the retargeted ads. Could have been FB in this case. Their ad platform definitely allows for retargeting.
  • mxvzr 10y ago
    Although they wouldn't have used a cookie here since it is mentioned that different browsers & devices were used. It would mean that segmenting was done on the backend, maybe using a user id from a social network.
    • msumpter 10y ago
      Cross devices targeting has become prevalent for most adtech targeting, at it's most basic they will correlate your public IP address but there are other methods for correlation.
• thom_nic 10y ago
  How is it OK to do this if the browser is sending DNT? Is it really voluntary on the part of the ad network and they can just choose to ignore it?
  • mrgreenfur 10y ago
    Yes, most of them just ignore it.
  • Kostic 10y ago
    That is correct. Ad networks aren't obligated to obey 'Do not Track' requests.
  • sp332 10y ago
    Yes, DNT is an effort by the industry to self-regulate. If too many companies ignore it, it's much more likely that they will be regulated "externally" (by Congress, FTC, FCC etc).
    • deleted 10y ago
      [deleted]
• libertine 10y ago
  Exactly - if op wants to he can install Ghostery, visit the website he was on and check if they had FB Remarketing pixel. Case closed.