How to add the Google +1 button to your web pages

“+1s from friends and contacts can be a useful signal to Google when determining the relevance of your page to a user’s query.”

Google’s +1 button is available in four different sizes.
This is the standard +1 button -> Click to check how it works.

Add the button to your web pages:

Step 1: Place this tag in the web page head or just before the close body tag:
<script type="text/javascript" src="http://apis.google.com/js/plusone.js"></script>
Step 2: Place this tag where you want the +1 button to render:
<g:plusone size="standard"></g:plusone>

This snippet is for the standard +1 button. If you want to use another size on your pages, change size=”standard” to size=”tall”
or to the other size that you want to use.