How to Make a Wise Crowd

September 13th, 20062:25 pm @ Ian Delaney

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USA Today takes a pop at internet techies citing the Wisdom of Crowds, suggesting that the recent digg and wikipedia controversies may show the idea is fallacious. David Freedman takes another swipe in ‘What’s Next: The Idiocy of Crowds‘ published at Inc.com, saying that on the internet, “the scum tends to rise to the top”.

As usual, the criticism is based on a misunderstanding of what the book actually says. It does not say that big groups of people make the best decisions. It says that they are likely to, under the correct conditions. The crowd needs to consist of people who are:

diverse
qualified
independent
self-interested

The interactions between the crowd needs to be carefully managed to avoid social factors distorting an individual’s best judgement. In addition, some problems – crossword puzzles, guess the weight of a prize bull, sports results, open-source software – are a lot more tractable to the approach than others – the most interesting news or the best pop album.

The old digg – which allowed bloc votes from groups of friends and pressure groups – fell down on more than one of these criteria. The book’s author, James Surowiecki, comments: “The thing that makes the wisdom of crowds work is lots of diverse opinions and independent judgments … Digg acknowledged it wanted more diversity of input.”

Personally, I think that at best digg can produce a front page that’s interesting to its typical user, which is fine. Similarly, the hit charts are only going to show what most people like, not necessarily what’s best for everyone. Problems like these involving qualitative judgements can only be solved when you have a crowd of people with similar tastes to you – which is why last.fm works for music recommendations and why a different news-voting community such as reddit or a CrispyNews group might be better for you.

Wikipedia is an interesting case and whatever problems it has aren’t going to be solved by tweaking an algorithm. I liked Jimmy Wales’ comment in the Wall Street Journal, though, that “…it is a misunderstanding to think of ‘openness’ as antithetical to quality. ‘Openness’ is going to be necessary in order to reach the highest levels of quality.”

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