1- Go to Facebook Developer's website
2- Submit Your blog name and blog URL. Keep Site name as your "Blog Title" and Site URL as your "blog address".
3- Now click on "Create App".
5- After submitting the security check code, you will see this page.
6- Copy the App ID and save it in a notepad.
7- Now go to Blogger Account > Dashboard > Template > Edit HTML > Proceed
8- Backup your template and check "Expand Widget Templates" and then search for this code.
<data:post.body/>
or
<div class='post-header-line-1'/>
Paste the code after <div class='post-header-line-1'/>
http://example.blogspot.com/ with you blog
9- Paste the code before </body>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
// init the FB JS SDK
FB.init({
appId : 'YOUR_APP_ID', // App ID from the app dashboard
channelUrl : '//WWW.YOUR_DOMAIN.COM/channel.html', // Channel file for x-domain comms
status : true, // Check Facebook Login status
xfbml : true // Look for social plugins on the page
});
// Additional initialization code such as adding Event Listeners goes here
};
// Load the SDK asynchronously
(function(d, s, id){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/all.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
</script>
Note: Change YOUR_APP_ID with your APP ID which provided from Facebook.
WWW.YOUR_DOMAIN.COM with your blog.