joined:Oct 29, 2012
It appears that Google is now actively reviewing sites by hand to prepare for their chrome ad blocker / filter. I have had the pleasure of having one of my site issued a failing notice, I then changed the design and have just gotten a passing score response back. It's nice that the WSC actually sends out email notification on time this time.
When you fail, they will actually provide a video walkthrough of how they found the issues, and how they were indeed measuring the pixels. It's actually pretty neat and helpful. Without getting into the politics of how they are now dictating how our sites should look, at least they're being transparent about how they are actually measuring
It appears that the "videos" are removed or hidden once the site passes the review...So I wasn't able to save / show the videos. It's actually good learning experience.
They use some sort of measuring ruler, to mark the width and height of content, and width and height of the Ads, then use that percentage to figure out the density. In addition, multiple pages were reviewed instead of just an unlucky one that got chosen. It appears that different reviewers are used since the video showed people using different ways to measure content / ads. It appears that they also always check the home page after a specific URL is reviewed.
I was hit for the 30% mobile height density. My take away is all the "tower" units 160x600 and 300x600 cannot be used on any short mobile content. Or you have to use it smartly...push that next to the other boilerplate contents so it does not count against the "main content real estate".
I am posting this here because I think the "rules" apply for all kinds of ad units, other than just adsense. Hope this can help anyone that is in process of designing or redesigning their mobile experience. I am personally proactively reviewing and redesigning my other sites that have not been reviewed to stay ahead of the game.