Why Should I add the Google +1 Button?
1. The Plus one button will have a major impact on your Search results. When a friend of yours does a search in Google, your +1s will count.
2. You can get a detailed report about the +1 metric and how it affects your search traffic over at Webmaster Tools. You can read more about it at the Official Google Webmaster Blog - http://googlewebmastercentral.blogspot.com/2011/06/1-reporting-in-google-webmaster-tools.html
Adding Google Plus one (+1) button to Blogger
1. If you are already using the official Blogger Sharing buttons, you should already be seeing the +1 buttons on your blog. If it is not, then go to that tutorial, and you will get the answer to how you can fix it.
2. No I don’t want to add those Blogger Sharing buttons, but would love to add the +1 button somehow. If that’s the case, then read on..
3.Generate the Google +1 button code using the following generator.(The codes and the tutorial will be updated with the options that you make using the generator)