The number of times our system was able to detect that an ad appeared on-screen.
How It's Used
On-screen impressions measures how many of your ads appeared in the viewable area of a person's screen. This metric can be used to see how efficiently you're reaching people and how many people had the opportunity to see your ad.
How It's Calculated
This metric is the same as Impressions in Facebook ads reporting.
* Nguồn: Facebook