This is newest and cool button to your blogger.
You can see DEMO On this site.(under post tile)
Try to click it and share it to your wall.
1. Log in to your blogger account and Go to Design >> Edit HTML
2. Put checked marked in Expand Widget Templates
*If you want to add this to after post header
3. Find this tag by using Ctrl+F
<div class=’post-header-line-1′> or <div class=’post-header-line-1’/>
*If you want to add this to post footer
4. Find this tag by using Ctrl+F <div class=’post-footer’>
5. After found one of tag, paste below code after above tag.
<div id="fb-root"></div> <script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script> <fb:send expr:href='data:post.url'></fb:send>
6. Now save your template.cheers..you are done.