Facebook is testing autoplay ads on mobile that have the sound turned on by default.
Why does this matter? Video ads with the sound off create a similar metrics problem as % of pixels in view (see above).
The explosion of video ads on Facebook has brought this to the forefront since most brands media plans now include a significant amount of advertiser where the consumer may never hear audio.
For comparison. Snapchat claims that 70% of their ads run with the sound on.
