4. Grab attention. Vertical videos on social media are competing against the infinite scroll, so try to engage viewers within the first three seconds with a great hook, ideally a visual one.

A video captured in portrait mode for smartphone users. Vertical videos are viewed without flipping the phone into landscape mode. Because people jump from Web page to Web page and from app to app ...

First autoplay sound, now vertical video -- the world's largest social network is recasting how video should be consumed on its own platforms. Facebook will now more completely display a ...