As Paul Graham already explained in the first installment of this analysis the biggest part of the change is due to a repositioning of the site early on.<p>The more recent change can not be attributed to that though.<p>Another important thing to note is that since these are all relative sizes it does not say that in an absolute sense there is less startup stuff, in an absolute sense it is most likely more due to the increased posting volume.<p>This just documents the change of the 'mix'.