fb-pixel-deconstructed.js

!function(win, doc, element, url, queue, new_script, invoking_script)
{
	// this function is going to attempt to define a queue function we can use to track events. if
	// we've defined it once, we're done.
	if (win.fbq) return;

	// callMethod is defined once we load the Facebook library, but if we get an fbq call before then we'll
	// all the arguments onto a queue to be dealt with later.
	queue = win.fbq = function()
	{
		queue.callMethod? queue.callMethod.apply(queue, arguments) : queue.queue.push(arguments)
	};

	// define _fbq in parallel with fbq, if it's not defined already.
	if (!win._fbq) win._fbq = queue;

	// we're now reshaping the queue function as an object with some helper parameters.
	queue.push = queue;
	queue.loaded = true;
	queue.version = '2.0';
	queue.queue = [];

	// inject the fbevents.js script from Facebook
	new_script = doc.createElement(element);
	new_script.async = true;
	new_script.src = url;
	invoking_script = doc.getElementsByTagName(element)[0];
	invoking_script.parentNode.insertBefore(new_script, invoking_script);
}(window, document, 'script', 'https://connect.facebook.net/en_US/fbevents.js');

// set up the library
fbq('init', '<ID>');

// track something
fbq('track', "PageView");