Login/ Register With Facebook

Step1:

 Please insert the Following script inside body tag of your login/register page. 

<div id="fb-root" style="float:left; width:1px;"></div>

<script>
window.fbAsyncInit = function() {
    FB.init({
       appId: 'Enter your API here',
       cookie: true,
       xfbml: true,
       oauth: true
    }); 
};