In September, Google started rolling out a new set of mobile-targeted ads – sticky-footer ads and interstitial ads. These ads are both part of a new type of ad referred to by Google as “Page-level Ads”, and differ from normal Adsense ads in that you place a small snippet of advertising code in your page’s header instead of placing individual ad units at specific locations on the page. Here are the new ad units, which must be individually enabled in your account before they can be used:
With this “Page-level ad code” in place, Google’s algorithms will determine where, and when, to place sticky footer ads or interstitials on your site. Page-level ads don’t count towards your three-ad-per-page limit, and Google claims that they will only be shown when it is optimal for maintaining user experience. Google stresses that both of these new ad types are easily dismissable by the user.
Both sticky-footer ads and interstitials were previously part of a closed beta, and have been in development since at least May when an Adsense engineer showed me the prototypes during a visit to the Google headquarters in Mountain View. However, Adsense publishers should soon begin seeing a banner pop up in their accounts inviting them to start using the new ad units: