viewing ads

In the online advertising industry, a viewable impression is a measure of whether a given advert was actually seen by a human being, as opposed to being out of view or served as the result of automated activity. The viewable impression guidelines are administered by the Media Rating Council and require that a minimum of 50% of the pixels in the advertisement were in an in-focus tab on the viewable space of the browser page for at least one continuous second.
The first system to deliver reports based on a viewable impression metric for standard IAB (Interactive Advertising Bureau) Display ad units, called RealVu, was developed by Rich Media Worldwide and accredited by the Media Rating Council on March 9, 2010. Other companies to offer viewable impressions include DMA-Institute OnScroll, C3 Metrics, Comscore, and AdYapper, while MSNBC utilizes ServeView, a proprietary system in use since 2010.
The definition of a viewable impression may depend on the type of the ad units and the reporting system. For example, a viewable impression for ads of pre-defined size delivered to pre-defined space on the content page is registered by RealVu when the ad content is loaded, rendered, and at least 60% of the ad surface area is within the visible area of a viewer's browser window on an in focus web page for at least one second. Click-through is enabled at the moment of the "viewable impression".
Viewable impressions were developed as an improvement of the online impression metrics measured by first ad servers developed in the mid-1990s, which analyze HTTP requests in a server log and cannot provide information on events fired by a viewer’s browser; thus, they cannot measure whether ad content was actually visible to a viewer.

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