I’ve seen quite a few people mention that they have problems with Facebook events. eg Purchase, lead, etc. firing more than once by a single visitor.

Either the page is refreshing (Stealth Seminar) or visitors are going to the “thank you page” repeatedly to get their digital download, check payments, etc.

This short piece of code uses a cookie to prevent the pixel from firing more than once in 10 days. If you want longer or shorter change the “10” in “10*24*60*60*1000” to the number of days you want.

Enjoy:

<script> (function(){ var nameEQ = "fb_event_once_only="; var fb_event_once_only = null; var ca = document.cookie.split(';'); /*check if correct cookie present*/ for(var i=0;i < ca.length;i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1,c.length); if (c.indexOf(nameEQ) == 0){ fb_event_once_only = c.substring(nameEQ.length,c.length); break; } } if('event_first_time' != fb_event_once_only){ fbq('track', 'Purchase', {value: 0.00, currency: 'USD'}); /*FB purchase event as normal - change this line as needed */ var date = new Date(); date.setTime(date.getTime()+(10*24*60*60*1000)); var expires = "; expires="+date.toGMTString(); var cookie_domain = document.domain.replace('www.','.'); document.cookie = 'fb_event_once_only=event_first_time'+expires+"; path=/; domain="+cookie_domain; /*set cookie if just fired event*/ } })(); </script>

Test with the Facebook Pixel Helper (Chrome Plugin). If it doesn’t work for you then contact us.

PS make sure you run this code after the Facebook pixel has loaded. I normally put it in the footer.