Comment by hackthemack

This has been known a long time. Freakanomics did a two part podcast on does advertising actually work. It is long but well worth a listen if you want to hear some science about advertising.

https://freakonomics.com/podcast/does-advertising-actually-w...

The second part goes into internet advertising.

https://freakonomics.com/podcast/does-advertising-actually-w...

There are transcripts of the episodes on the page if you want to read instead of listen.