Topic name it self suggest you to how this topic is important for blog and website owner.
Using google 1+ button you can make your site reputation in the google search engine.
When any one click on this button it will recommend to google that this site is among the best.and your google seach index rank will decrease and chance to come in top 10 search result in google.
For adding this button refer this link
http://www.google.com/webmasters/+1/button/
choose your google 1+ button size and copy paste code given in the box in site
box contain two codes
1.javascript : copy paste javascript link in to tag
2.Button code : button code is very simple (Do not modify it) Place this code where you want to display google 1+ button.
Enjoy google latest feature