Economic Times | 03/10/2021 05:01 PM | Click to read full article
These so-called "dark ads" are visible only to the targeted user. They are hard to track, since an ad may only appear a few times before disappearing. Also, the user doesn't know whether the ads they see are being shown to others, or whether they are being singled-out based on their identity data.
There's a lack of transparency surrounding the automated systems Facebook employs to target users with ads, as well as recommendations it provides to advertisers.