We're all Linux users...

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That's what this article (linked below in the source for the quote) says. And you know what? It's true.

Taft asked DiBona what open-source software Google uses in deployment or production at Google. DiBona replied, "We use the Linux kernel -- every time you use Google, you're using a Linux machine. And then we have some fairly common open-source tools that we run on top of those, and then on top of those we run our proprietary software for serving Google, Gmail and all the different services."

- We're All Linux Users - by: Steven J. Vaughan-Nichols