I did have that experience myself. Me and colleague are talking about, back in last November, Paris attack thing. And we are working in the media sector, he ju

I did have that experience myself. Me and colleague are talking about, back in last November, Paris attack thing. And we are working in the media sector, he just mentioned that we could use the user behavior stream to detect whether something big happens. Now it becomes a viral item detector, also providing real time metrics to other services. It might not be significant, but it did evolve into something useful.