As a rough datapoint, I run a consumer targeted e-commerce site. We ran a campaign before Christmas were we were selling a new product that was only marketed on Facebook, we are certain that (almost) all customers found it though that Facebook campaign. Facebook was only able to
attribute about 50% of the sales to the ads, it should have been close to 100%. This then meant that Facebooks estimated CPA was effectively double what it actually was.
Important to note about 60% of our customers are on an iOS device, which is a little higher than the global average but matches the market segment we are in in the UK.
The situation improved after about 4 weeks, I believe Facebook now uses some "AI" to help with attribution on iOS, but it's somewhat difficult to be sure as by then we had other campaigns running.
So, this will definitely be effecting marketers decision making process of where to allocate spend. It certainly made us more courteous about spending on Facebook.
Important to note about 60% of our customers are on an iOS device, which is a little higher than the global average but matches the market segment we are in in the UK.
The situation improved after about 4 weeks, I believe Facebook now uses some "AI" to help with attribution on iOS, but it's somewhat difficult to be sure as by then we had other campaigns running.
So, this will definitely be effecting marketers decision making process of where to allocate spend. It certainly made us more courteous about spending on Facebook.