"When your visitors come across something interesting on your site, sometimes you want to encourage a simple...

"When your visitors come across something interesting on your site, sometimes you want to encourage a simple endorsement (like +1). Other times, however, you want to help visitors share with their friends, right away. Today’s new Google+ Share button lets you do just that."

Get the code for your Share button here: https://developers.google.com/+/plugins/share/

#protips
http://googleplusplatform.blogspot.co.uk/2012/04/introducing-google-share-button.html