NASA’s astrobiology magazine has a good, in-depth review of the book in the current ish.
In his modernization of wearing your karma on your sleeve, society is governed by reputation and actions. This is not so much an ideal world, as a practical one which keeps considerable adventure and moves in anything but boring ways. ‘The whole point ..was to be more reputable than the next ad-hoc, to succeed on merit, not trickery, despite assassinations and the like.’
Therein lies Doctorow’s thesis: an internet-saavy version of personal capital, particularly one’s success rating with friends and neighbors. Down and Out in the Magic Kingdom coins this all-encompassing and frequently updated reputation rating, one’s Whuffie.
While friends’ opinions may matter most in getting good Whuffie, a weighted score also makes room for those both likely– and unlikely– to be compatible. This version resembles a counterpoint system, and is called left-handed Whuffie: respect garnered from people who share very few of your own opinions. This is not a world of sycophants who seek mutual admiration. The future apparently holds true to both majority power, and also minority empowerment.