Google AdWords offers seller ratings for shopping related ads, as well as other ads. These are an automated extension type that showcases advertisers with high ratings. Google will collect seller ratings from reputable sources that aggregate business reviews. This AdWords ad extension shows below the ad and looks like this:

Many advertisers who are new ask why they don’t see these seller ratings for their sites. Well, it normally takes at least 12 months of data aggregation for Google to start showing these ratings. Often it also requires at least 150 unique seller reviews over the past 12 months. If you do not have 150 reviews in the past month, you might lose those ratings.

The help docs read:

Google was asked this on Twitter:

Forum discussion at Twitter.

This post was scheduled to go live today but was written earlier – I am currently offline today.