Word of mouth is powerful. When you have a choice to make, it’s common to turn to the people you trust. But what about word of click? How can getting a suggestion from a friend or co-worker when you need it be as simple as having a hallway conversation -- or even simpler?

We want to make it easy for Google users to get recommendations from the people they trust right when they’re searching. That’s why we’re introducing the +1 button. With a single click, the +1 button lets signed-in Google users recommend the content they like on the web to their friends and contacts right when it’s most useful -- on Google search.

+1 is a simple idea. Let’s use a hypothetical Brian as an example. When Brian signs into his Google account and sees one of your ads or organic search results on Google, he can +1 it and recommend your page to the world.

The next time Brian’s friend Mary is signed in and searching on Google and your page appears, she might see a personalized annotation letting her know that Brian +1’d it. So Brian’s +1 helps Mary decide that your site is worth checking out.

We expect that personalized annotations will help users know when your ads and organic search results are relevant to them, increasing the chances that they'll end up on your site. You don’t have to make adjustments to your advertising strategy based on +1 buttons, and the way we calculate Quality Score isn’t changing (though +1s will be one of many signals we use to calculate organic search ranking). Think of +1 buttons as an enhancement that can help already successful search campaigns perform even better.

At first the +1 button will appear for English searches only on Google.com, but we’re working to add more languages in the future. You don’t have to make any changes to your campaigns for +1s to help you -- over the coming weeks, we’ll add +1 buttons to ads and search results on Google.com.

But the +1 button isn’t just for search pages. We’re working on a +1 button that you can put on your pages too, making it easy for people to recommend your content on Google search without leaving your site. If you want to be notified when the +1 button is available for your website, you can sign up for email updates at our +1 webmaster site.

The +1 button is the next step in our effort to find relevance through relationships on the web. We’re excited about using +1s to make search, and your search campaigns, more personal, relevant and compelling. And we hope you’re excited too!

To learn more about the +1 button and how it affects your search ads, visit Google Ad Innovations.

Posted by Dan Friedman, Inside AdWords crew