I recently had an opportunity to provide an updated definition of “web 2.0” for a project I’m consulting on. The project, managed by the National Academy of Engineering (NAE), is called Changing the Conversation: From Research to Action. “Web 2.0” is one of those terms that just won’t die. Even as some have tried to invent and sell newer-sounding terms like “web 3.0,” there are still many for whom the underlying concepts of “web 2.0” and social media are new, unfamiliar, or ready to be revisited after an initial or limited exposure.