SOCIAL MEDIA VIDEO
The majority of Facebook users operate Facebook from their mobile devices, and vertical and square format videos are the most popular videos in mobile newsfeeds.
Typical formats include 9×16 (full vertical) used with Facebook and Instagram Stories and Facebook (Full Portrait), 4×5 used with Facebook, Instagram, and Twitter, 2×3 used with Facebook, and 1×1 used with Facebook, Instagram, and Twitter (Square).