I use Linux. All my machines have Linux installed. Even my Chromebook, which is based on Gentoo if I’m not mistaken, dual-boots Chrome OS and Arch ARM.
What about the rest of the world?
While Linux is widely used in the server world, adoption in the consumer side is limited.
The infographic below highlights the most popular Linux distributions used and how much marketshare Linux has compared with the rest of the operating systems. I have included the mobile operating systems as an added bonus.