Google Chrome, HTML5, and the new Web platform

A friend and I were debating the other day: Is it appropriate to refer to Google's Chrome OS as a platform? We in the tech press often use the terms "operating system" and "platform" interchangeably, but they aren't always the same thing. Ubuntu is an OS, for example, but it's not really a platform. The platform in that case is Linux.Sean (Diddy) Combs John Grisham Rachael Ray Dave Chappelle Larry the Cable Guy Tyra Banks George Lopez Regis Philbin Serena Williams Ryan Seacrest