Facebook has introduced a new video feature that allows you and your friend to collaborate to make a video! After logging into your Facebook account, you can shot a video to continue what your friend has shot. The maximum video length allowed is at 20 seconds so that everyone has a chance to participate in the filming. Once completed, you and your friends can share the whole video in social network. All of the video content is not restricted to any elements and depends on your creativity.
Facebook Riff is currently available in Google Play Store and Apple App Store. Watch the Riff sample demonstration here