Web 2.0 - Definition?

I know Web 2.0 means different things to different people and therefore to give a precise definition is difficult but this 'quiz' is a perfect example of how some people just don't get it. What does 'trackback', cost of MySpace, definition of RSS, the founder of Wikipedia, etc. have to do with Web 2.0? Perhaps it is Jim Rapoza who is, "pretending" to know.