You can shoot or import a video of up to 7 seconds to use as a profile video. Profile videos appear at the top of your profile, like a profile picture. You can currently only add profile video from iPhone.
How to add Facebook profile video
To add a profile video from an iPhone:
Go to your profile and tap on your profile picture or video.
Press on Take a new profile video to take a new video or on Import from Camera Roll to choose a video on your phone.
Press on next, then tap the bar at the bottom of the screen to choose a thumbnail for your video.
And finally press Register
