Of course all of you Hacker News Monday morning quarterbacks have taken a website from launch to Twitter's current level of traffic, right? If so, please let us know which site that was so we can compare your experience and your decisions against those of the Twitter team. If not, perhaps you should go and do that first before sounding off on Twitter. No, I'm not a friend of Blane Cook's, nor am I a Twitter apologist -- I don't even use the service. But I do respect startup founders and builders far more than their critics, and I know that website architecture -- like most things -- is always easier in hindsight. For perspective, please read the Hot or Not story in "Founders at Work," then read Teddy Roosevelt's "Man in the Arena" quotation that Arrington is so fond of. (And yes I realize that reference is ironic given that Arrington started the pile-on against Blaine Cook. Arrington should try to remember that "it's not the critic that counts.")