Ask HN: How is this 'cross advert' possible?

Posted by bikamonki on Friday January 31, 2014 @11:25PM
from the ask-hn dept.

I was logged into FB on one tab and then searched for a bike on Amazon, on a new tab. I think that I was not logged into Amazon. A couple of hours later I logged back into FB and there was this ad: http://www.grupster.com/crossadvert/fb_ss_blrd.png.

How do they make this work? Cookies? Do I have adware on my laptop/browser? Do FB and Amazon share traffic data? All of the above?

( 4 comments | on HN )

Re:Ask HN: How is this 'cross advert' possible? by thisiszen on Saturday February 01, 2014 @12:23AM (#7160950)

http://www.perfectaudience.com/

[ Parent | on HN ]

Re:Ask HN: How is this 'cross advert' possible? by bikamonki on Saturday February 01, 2014 @10:26AM (#7161850)

Thanks, this explains it! Annoying and scary....

[ Parent | on HN ]

Re:Ask HN: How is this 'cross advert' possible? by greenyoda on Friday January 31, 2014 @11:50PM (#7160876)

It's also possible that it was a coincidence.

[ Parent | on HN ]

Re:Ask HN: How is this 'cross advert' possible? by bikamonki on Saturday February 01, 2014 @06:15AM (#7161399)

If it was the first time, maybe. I've seen it also when browsing my local newspaper site: ads with sites/products I use/search for.

[ Parent | on HN ]