http://www.webpronews.com/how-to-connec ... ns-2011-11
As you may know, Google lets you tie the +1’s of your Google+ Page to your site, your search results, and your AdWords ads. The company announced a new AdWords feature called Social Extensions, which is how you include your AdWords campaigns.
“Currently (and for campaigns that don’t have Social Extensions enabled) your AdWords ads only show +1’s from people who have +1’d that ad’s landing page,” explains Dan Friedman of Google’s Inside AdWords Crew. “This limits the likelihood that someone who sees your ad will have a friend or contact who’s recommended it. By enabling Social Extensions on your ad campaigns you’re able to leverage all the +1’s your brand has received, whether it be on a search result, on your Google+ Page, your website or on your ads, making it more likely that someone who sees your ad will have a friend or contact who has recommended it.”