The average percentage of the Facebooka social networking site located at facebook.com. Canvas that people saw. Canvas is a screen that opens on mobile after a person clicks the Canvas link in your adUsed to structure your ads, keywords (for search campaigns) and targeting (for GROUP). It may include a series of interactive or multimedia components, including video, images, product catalogs and more. Calculates the average percentage of the Facebook Canvas that people saw, based on the number of components viewed. It counts views of the Canvas that was linked from your ad, but not views of other Canvas units linked from the original Canvas.