Possibility of Improving Your AdWords Quality Score with Google +1
The +1 button was deployed earlier this year across organic and PPC listings in the Google SERPs. The main question that has bubbled to the top regards how +1 will affect AdWords quality score.
+1: A Quality Score Factor?
The more +1 votes a website or page has, the more weight it carries in increasing quality score. As of now, +1 is not a quality score factor, instead ad extensions and other Google-additions to the ad space directly influence your CTR which directly influences your quality score.
When a website visitors clicks the +1 button on your site (or actually in the SERPs), that visitor's friends will see that they +1'd your website. They have voted for you and your website and this will entice their friends to also click through your ad to visit your website. The social interaction aids in increasing your ads' CTR.
Add the +1 Button to Your Website
Add the +1 button to every page on your site - including your PPC landing pages. There are a few pitfalls in the current +1 system. Right now the +1 votes are page-specific.
PPC advertisers often use a wide range of landing pages that are tightly focused - so this means that accumulating any meaningful number of +1 votes would be a challenge.