Listening to this podcast on Sitepoint
http://www.sitepoint.com/blogs/2009/12/ ... lex-payne/
Kevin: I’m a tech guy, what would you say is the technology mix at Twitter? I’m thinking not just the web languages you guys use, but I mean, are you all Mac people at Twitter?
Alex: For the most part, yeah. I think everyone now is running on Apple hardware, all of our engineers. We have a couple of people who boot into Linux day to day but for the most part, we’re all Mac folks.
Alex: I mean back then it happened to be what was around the house. Today it’s more that nobody else has that kind of out-of-the-box, everything works experience and nobody else produces hardware of that quality which is just baffling. Like some days, I would actually prefer to be running on Linux so I could do weird things like run a tiling window manager but looking around at non-Apple hardware, nobody’s making good stuff even if you want to spend $2,500, it’s just really hard to get a nice machine.
Kevin: Yeah, one of the last Mac hold-outs at the SitePoint office, ironically, was our designer and recently, he just went out looking for a laptop and was not at all planning to get a Mac but he couldn’t find a good quality PC laptop and ended up buying a Mac for that reason.
Alex: Yeah, it’s really, really surprising. I don’t know what the Dells and Sonys of the world are thinking but it’s very odd.
Yeah, for $2,500 it's just impossible to find any laptop that even approaches Apple quality.

Of course what he and the Sitepoint schmuck really mean by "Apple quality" is that it doesn't have an Apple logo on it and Steve Jobs hasn't blessed it with a bit of his holy spit.
