Facebook Pixel Id
If you want to make use of a Facebook Pixel for tracking visits to your Form, you need to find the Facebook Pixel Id
The Pixel Id can be found in the list of Facebook Pixels you have created, typically right after or below the name of the Facebook Pixel. The Id is in the form of a long number, ex: 496568867958384.
Alternatively you can also grab the Facebook Pixel Id from the Facebook Pixel Code. In that case you would have something like the following from Facebook:
<!-- Facebook Pixel Code -->
<script>
!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', '
496568867958384');
fbq('track', 'PageView');
</script>
<noscript><img height="1" width="1" style="display:none"
src="https://www.facebook.com/tr?id=
496568867958384&ev=PageView&noscript=1"
/></noscript>
<!-- End Facebook Pixel Code -->
What you want to copy is highlighted in green in the sample above. Do note that YOUR Pixel Id will obviously be a different number. You want to grab only that number and Save it in the Form Settings view in the Facebook Pixel Id field.