When I say "Linux", I mean Red Hat. I mean Slackware. I mean Mandrake. I mean Debian. I mean SuSe. I mean Gentoo. I mean every one of the 2 kadzillion distributions out there, based around a Linux kernel with substantially similar userlands, mostly based on GNU tools, that are floating around the ether.

So... do you include Android? It's worth asking, because though it uses a Linux kernel, it's a heavily modified one (little chance of Binder ever being accepted into Mainline, or of Android abandoning it), and its userland is very different from anything you're used to from GNU.

Edit: I can't find a date, but from other stuff in it I'm guessing the article is from quite a few years ago, before Android was mainstream or even existed.