Where an ad appears on a site can often be a determiner of how well the ad performs. Traditionally ads at the top of a page were assumed to have the best performance. However, advances in both site development and ad formats mean that what was true in the past may no longer be true.
The graph below illustrates the performance of ads on a single site. We’re the ad server, and they have bought our inArticle ads. We often conduct tests on our own formats to make sure we’ve told the truth about how they perform.
In this case, the axis on the left represents the amount of time spent on the page, and each bar represents a part of the page measured in pixel height. The bars proceed from left to right, with the left most bar indicating the performance of ads at the top of the page and the right most bar representing the performance of ads at the bottom of the page. We’ve conducted this analysis on many of the sites on our premium publisher network.
Our analysis has shown that across a wide range of sites, users spend more than double the time with an ad located around an article than they do at the top of the page. This demonstrates that formats like our inArticle, which runs a video within an article, can be much more effective than banners on the top of the page, which traditionally have been thought to be the most effective places to advertise.
One caveat to all this : all formats lose engagement as the viewer moves down the page. Even the inArticle format’s viewability will drop tremendously if it is placed below the 2000 px or 50% of the page.