Sobo, a “social soundboard” described as Vine for audio, has launched for iPhone and iPad owners. Created by Yammer co-founder Alan Braverman, the app allows users to record six-second voice messages using the microphone on their device and then send them to friends and followers. Speaking on the length of the videos, Braverman said: "We started at six [seconds], and figured maybe we'd change it later. But then we just never did. There was never anything scientific behind it, to tell you the truth."