In the coming weeks, your search results and ads on Google will include a +1 button, which users can click to recommend your ads. You don’t need to make any changes to your account in order to take advantage of them. The final landing page URL of your ads can also appear on the Google profile of any user who +1’s your ad.
Here’s how the +1 button works:
Let’s say you own a hotel in Madrid. Brian had a lovely stay at your hotel last summer. When Brian starts researching accommodations for his next trip to Spain, he searches on Google while signed into his Google account, and sees your ad. He clicks the +1 button on the ad to recommend it to his contacts.
When Brian’s friend Ann plans her trip to Spain, she signs in to her Google account, searches, and also sees your ad – plus the personalized annotation that Brian +1’d it. Knowing that Brian recommends your hotel helps Ann decide where to stay during her travels.