That video seems to be the exact opposite of a single convincing slide. I watched it and have no idea what SoundCloud is supposed to do. In the context of social media platforms, I would think that sound, for the most part, would be music. The video hardly mentions music and talks about generic "sounds", which may be interesting from some perspectives, but I don't have the faintest clue why it would be a be the basis of a missing youtube/twitter/flikr/whatever as the slide mentioned implies.