 Periscope is an app on your phone that lets you broadcast live video to anywhere in the world. I published some software on the internet which showed how to do live video broadcasting. Then about a year later, two young Stanford graduates were looking for software to do exactly that for an app they were starting to build, which was a video sharing app. And they found my software and they asked me if I could join them in help. We had anticipated having a few confident, perhaps celebrity broadcasters and a lot of viewers. As it turns out, lots and lots and lots of people want to broadcast themselves. So at any moment there are many thousands of people broadcasting live and that was something that we really hadn't expected. Being able to comment breaks the fourth wall. It brings the viewer into the broadcast. People are broadcasting their everyday moments. It's just part of their everyday life. And that is really quite a positive thing because it makes you realise that these people all around the world, they're not that different to us. Their everyday moments are just as everyday as ours. And that's something quite satisfying about that, I think.