The average total time, in seconds, that people spent viewing a a social networking site located at facebook.com. Canvas. Canvas is a screen that opens on mobile after a person clicks the Canvas link in your Used 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. Counts average total time spent viewing the Canvas that was linked from your ad. It also includes time spent in other Canvas units linked from the original Canvas.