Whuffie is the ephemeral, reputation-based currency of Cory Doctorow's science fiction novel Down and Out in the Magic Kingdom and his short story Truncat. This book describes a post-scarcity economy: All the necessities (and most of the luxuries) of life are free for the taking. A person's current Whuffie is instantly viewable to anyone, as everybody has a brain-implant giving them an interface with the Net.
In the novel Down and Out in the Magic Kingdom, Industrial-era economic constraints and scarcity-management regimes have been made obsolete by technology: Whuffie has replaced money, providing an esteem- & admiration-rewarding motivation for people to do useful and creative things. A person's Whuffie is a general measurement of his or her overall reputation and is gained (or lost) according to a person's favorable (or unfavorable) actions. Public opinion determines which actions are favorable or unfavorable. The Whuffie of one who rudely pushes past others may suffer, as she falls within the disapprobation of those pushed, or witnesses of the event. A much-loved symphony, on the other hand, continues to earn the composer Whuffie as more people enjoy it. Some judgments contributing to an individual's Whuffie are automatic and require no conscious thought on the part of others, as all possess brain chips. As brain dumps allow machines to carry consciousness, the machines can do the thinking for people and allow them to know the results automatically.
While there are few details in the novel of how this system actually works, it is described in idealistic terms:
- "Whuffie recaptured the true essence of money: in the old days, if you were broke but respected, you wouldn't starve; contrariwise, if you were rich and hated, no sum could buy you security and peace. By measuring the thing that money really represented — your personal capital with your friends and neighbors — you more accurately gauged your success".
A person with a score of 0 is just as capable of giving and revoking Whuffie as someone with a score of 1,000,000. The person with the million-point score would be invited to parties and elite events while his bottomed-out counterpart would probably not even be allowed into reputable clubs or restaurants; but both of their opinions on someone else would count for the same amount of gross Whuffie.
Like all economic systems, Whuffie has effects that seem undesirable to many. It might tend to favour popular speech at the expense of public discourse, and it could frequently be uninformative: if a person has a high Whuffie score, is it for guitar playing or auto repair? However, both of these are already the status quo under the existing capitalist system, and the concept of weighted Whuffie helps make better decisions on a person-by-person basis, and thus is more flexible than rating someone by their bank account. Also, the Whuffie system (in the book) keeps a public history of how each person's Whuffie was earned, unlike the secret origins of other people's money in a capitalist system.
Similarities to other stories 
Howard L. Myers wrote of a similar system based on admiration in his story "All Around the Universe," written between 1967 and 1971. Iain M. Banks uses a similar currency system for the Nasqueron Dwellers based on "Kudos" in his novel The Algebraist. Jack Vance uses a reputation system called "strakh" as currency in his short story The Moon Moth, published in 1961.
The Whuffie Bank 
The Whuffie Bank launched as a non-profit company at the TechCrunch50 conference on September 15, 2009. The organization aims to create a reputation currency for social networks. However, their URL and Twitter feed has been inactive since April 2012.
Doctorow has indicated that the word 'Whuffie' is a made-up word he used in high school, and is not a vocalization of an abbreviation (in the style of 'Gazoo' — GSU, or Grad Students Union) or of Wi-Fi as is often believed.
Whuffie is mentioned in Doctorow's Eastern Standard Tribe, but appears to be in the general sense of building reputation.
See also 
- karma (Slashdot)
- Brownie points
- social capital
- Attention economy
- Gift economy
- Reputation system
- Activity stream
- Pay with a Tweet
- Tara Hunt, The Whuffie Factor: Using the Power of Social Networks to Build Your Business, 2009, Random House, ISBN 978-0-307-40950-8
- Richard Koman; Cory Doctorow (2003-02-27). "Cory Doctorow's Bitchun' World: P2P Gone Wild". O'Reilly Network. Retrieved 2006-09-23.
- Jason Kincaid (September 15, 2009). "TC50: Meet The Whuffie, A New Currency That's Based On Your Online Reputation". TechCrunch.
- Cory Doctorow (2003-01-14). "Down and Out in the Magic Kingdom Frequently Asked Questions, Part 1". Retrieved 2006-09-23.