Facebook Riff has you making videos with your friends' help
 

No, Facebook isn't done experimenting with mobile apps yet -- meet Riff, a just-launched app for Android and iOS that has you building collaborative videos. You start by recording a short clip (under 20 seconds) and giving it a topic. After that, you...

http://www.engadget.com/2015/04/01/f...=rss_truncated