You have probably noticed the “Ads by Google” label that appears with ads on your site. AdSense display this label because they want users to have an awareness and understanding of the ads they see online and where they come from.
As more and more advertisers use rich media ad formats, such as Flash and interactive ads, AdSense want to provide the same benefit to users for those ad formats. So today they’re starting to add the “Ads by Google” message to rich media ads in a way that’s unobtrusive to the ad creative and your site, but as user-friendly as our current “Ads by Google” notices on other ad formats.
You’ll soon notice a small “i” (for “information”) icon overlay in the bottom right-hand corner of these ads, which will expand when the user hovers over it. This was specially designed for rich media ads. This new message will appear on ads created by AdWords advertisers, and will show up on your website’s standard AdSense ad units.
Just like before, users who click on the “Ads by Google” label will be taken to a page where they can learn more about online advertising and the ads they’ve just seen. AdSense tests of this new message format on rich media ads showed that they provided information to users without affecting ad performance.