Google officially launched the +1 button for websites. This is good news for website owners who want additional exposure for their content. The implementation of Google +1 is pretty straightforward. You need to paste two codes, one to be placed at the header.php file and the other at the line where you want the +1 button to appear.
To get the Google +1 code, go here. To customize your button, you may select a small, medium, standard or tall button. You can also opt for the more advanced installation which gives you the ability to specify the URL you want +1′d.
Once you get your code, you paste the tags on the header and the specific part of your website where you want the +1 button to appear.
For this website, I opted to put the Google +1 button on top, right before the content. I copied the second tag to the single.php file.
For features of Google +1, watch this video from Google.