IBM:

Gain insight into how and why people think, act, and feel the way they do. This service applies linguistic analytics and personality theory to infer attributes from a person’s unstructured text.

Based on my Twitter feed, Watson tells me I am “a bit critical and excitable. You are philosophical: you are open to and intrigued by new ideas and love to explore them. You are solemn: you are generally serious and do not joke much. And you are authority-challenging: you prefer to challenge authority and traditional values to help bring about positive changes” and that I “care more about making your own path than following what others have done.”

Mostly accurate. Thanks to Jason Kottke for the link.