Shirky: The Semantic Web, Syllogism, and Worldview: "...In the real world, we are usually operating with partial, inconclusive or context-sensitive information. When we have to make a decision based on this information, we guess, extrapolate, intuit, we do what we did last time, we do what we think our friends would do or what Jesus or Joan Jett would have done, we do all of those things and more, but we almost never use actual deductive logic. ...As a consequence, almost none of the statements we make, even seemingly obvious ones, are true in the way the Semantic Web needs them to be true. "