
It is worth to notice that in the past the peaks were somewhere between 16h and 17h GMT. Now it occurs about two hours later. This shows a recent growth in the Americas. Or, in other words, they are catching up with the usage rate of the Europeans.
And when will Asia catch up? When it does, we should see lesser fluctuations of the number of concurrent users online between day and night, or at least a change in the patterns of the curve. If you want to see these daily fluctuations, make a jump at the very nice graphs of http://nyanyan.to.