Google +1 and SEO

One way that people can share or promote your content is with the Google +1 button. Adding this button to your web pages so people can easily perform a Google share is a great way to improve the visibility of your content in Google search results.

When someone clicks on a Google share button, the social influence of the link increases, improving the link’s chance of relevancy in search results.

Another impact of the +1 button on a website is that when the button is clicked, the Google bot is notified and automatically re-crawls and indexes the page.