Do not take this as snark. Not meant as such. Just observation, begrudging admiration is as negative as it gets :)
My guess is that trendy internet start-ups have a Mac culture. I'm not sure, I'm not in trendy internet start-up land. The same is true in academia though, which is my land. Go to an academic conference and we're talking predominantly Mac.
I love the way they spin the "did not test on Windows, the most popular desktop OS" fail to "isn't System so cool and retor, isn't it awesome?". That takes a fair amount of chutzpah and a serious inability for stuff like this to faze you. Which is probably a great character quality for a dev team whose software touches millions.