Nat Friedman Seems to Be Employing a PR Agency to Turn a Wikipedia Page About Him Into Hagiography and Hide His Strong Links to the Serial Strangler Alex Graveley
Narrowing down to desktops and laptops, and judging by Web requests that go through Clownflare, many people there use GNU/Linux or Google's 'bastardised' version of it (with spyware preloaded)
From what we can gather, the tram ticketing system does not use Windows; we never saw it crashing or rebooting (or showing some Windows logo) in decades, so we assume it runs some kind of Linux