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<div style='display:none'>
<div id='exestylepopups' style='padding:10px; background:#fff;'>
<center><h3 class="mdbox-title">Receive all updates via Facebook. Just Click the Like Button Below...</h3></center><center>
<iframe src="//www.facebook.com/plugins/likebox.php?href=http%3A%2F%2Fwww.facebook.com%2FSoftwaresRockers&amp;width=300&amp;colorscheme=light&amp;show_faces=true&amp;border_color=%23ffffff&amp;stream=false&amp;header=false&amp;height=258" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:300px; height:258px;" allowtransparency="true"></iframe>
</center><p style=" float:right; margin-right:35px; font-size:9px;" >Get This <a style=" font-size:9px; color:#3B78CD; text-decoration:none;" href="http://www.spiceupblogging.com">SpiceUpBlogging</a></p>
</div></div>

Step 2: Replace SoftwaresRockers with your facebook page name.

Step 3: This is designed to appear the likebox once. If you need this to appear all times of loading your site, then change the value true to false.

Step 4: Now save the gadget.

Note: To make your widget appears only on your homepage do the following...

Add the following code before the provided code.

< b:if cond='data:blog.url == data:blog.homepageUrl'>

And add the following code after the provided code

< /b:if>

source