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For more detailed information: https://developers.facebook.com/docs/reference/ads-api/rtb/#...

thank you, this is super interesting.

I used to think this was the case, but I use chrome in incognito mode ( and only for fb!) and I'm starting to get retargeted ads. I suspect they are using some sort of 3rd party on the backend. Moreover, it's not only ads now ... I'm also seeing suggested groups that seem eerily creepy ...

Makes sense. Will disabling third-party cookies, as per relevant configuration in Chrome or Firefox, make this impossible?