“Web 2.0” is a phrase that’s been around for a few years, but it still has some uncertainty around it. Is it just marketing hype, or does it represent a substantial change in the way companies ...

doesn't have a hard boundary but, rather, a gravitational core," he wrote in a five-page essay that resorted to definition by example, name-checking Flickr, Napster, blogging, wikis and syndication.