Lazy Load facebook pixel

LazyLoadFacebook.js

var facebookLoader = function() {
    window.removeEventListener('scroll', facebookLoader);
    !function(f,b,e,v,n,t,s)
    {if(f.fbq)return;n=f.fbq=function(){n.callMethod?
        n.callMethod.apply(n,arguments):n.queue.push(arguments)};
        if(!f._fbq)f._fbq=n;n.push=n;n.loaded=!0;n.version='2.0';
        n.queue=[];t=b.createElement(e);t.async=!0;
        t.src=v;s=b.getElementsByTagName(e)[0];
        s.parentNode.insertBefore(t,s)}(window, document,'script',
        'https://connect.facebook.net/en_US/fbevents.js');
    fbq('init', 'YOUR_ID_HERE');
    fbq('track', 'PageView');
}

window.addEventListener('scroll', facebookLoader);