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IFrames are Old School 

<iframe src="https://www.facebook.com/plugins/like.php?href=YOUR_URL" scrolling="no" frameborder="0" style="border:none; width:450px; height:80px">

Switch over to XFBML Scripts for a Like Box, it will get you more likes. Just takes 3 easy steps.

Add the following code just below the <body>

<div id="fb-root"></div> 
(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#xfbml=1&appId=128405173935907"; 
fjs.parentNode.insertBefore(js, fjs); 
(document, 'script', 'facebook-jssdk')); 

Add the following in the html tag like

<html xmlns:fb="http://ogp.me/ns/fb#"> 

Then lastly add the following where you want to place the like box

<fb:like href="<URL>" send="true" width="450" show_faces="true"></fb:like> 
Send="true" // if you want the viewers to send the same link/page to their friends & spread your message