"What is the second derivative of the view count he mentions at <a href=""https://www.youtube.com/watch?v=nkWmiNRPU-c&amp;t=01h08m45s"">01:08:45</a>?",(reply>), @Erdal Karaca i would imagine 'view count' would just be a plot of views per time. the second derivative would then just be a hyper exponential increase in viewership.,(reply>), @Yuri sure, I was more interested in the model underlying their definition of "view count"... if you can do the second derivative, then it is most probably not a linear function,(reply>), It's the derivative of the first derivative.