|"For example, if you were to select 'purchase' as your conversion, and apply this default attribution model and attribution window, your reporting will reflect purchases that can be attributed by Facebook to the last ad click that happened within 28 days prior to purchase or the last ad impression that occurred within one day of purchase, whichever happened last."|
Facebook has contacted all its advertisers to inform them about coming changes:
|"Upcoming digital privacy initiatives affecting multiple browsers will limit business's ability to measure people's interactions across domains and devices. Among those limitations is the ability for businesses to attribute conversion events back to an ad over longer attribution windows."|
That change is likely only to impact advanced Facebook marketers or companies with larger campaigns. The new rules will kick in on October 12 - and you'll need to act now if you want to pull any data from the system before the 28-day option disappears for good.