zlacker

Radio and TV have ratings and viewership estimations, billboards and video panels presumably have a knowable amount of vehicle/foot traffic. These things are independently verifiable to anyone so inclined.

When buying internet ad space, though, the information asymmetry is vastly different.

>>hamand+(OP)
As far as I understand nothing prevent us from introducing independent verification for online ads?

>>deely3+fM
How? Sure, you can go look for yourself, but that will never tell you if the other million users are seeing the same ad.