+1 buttons let people who love your content recommend it on Google search.
How does +1 affect search results?
+1 helps people discover relevant content—a website, a Google search result, or an ad—from the people they already know and trust. Adding the +1 button to your pages lets users recommend your content, knowing that their friends and contacts will see their recommendation when it’s most relevant—in the context of Google search results.
How to implement it
This is the code to put in your header, or body tag:
This is the code to put where you want the button to appear:
Check out the video for more info.
Then track the click in Google Analytics.
Out of the box, Google Analytics provides integrated tracking with the Google +1 button. This means if you have set up both Google +1 and the latest version of Google Analytics on the same page, all +1 social interactions will be tracked automatically.