Some selected excerpts:
Although wikis and other Web 2.0 platforms for the creation of content are often described in purely egalitarian terms - as the products of communities of equals - that's just a utopian fantasy.As I have said before, summing collective ignorance isn't going to create wisdom. Take a majority vote from people who don't know the answer, and you're not going to get the right answer.
Quality ... hinges not just, or even primarily ... on the number of contributors ... [but] on the talent of the contributors.
When you look deeply into Wikipedia, beyond the shiny surface of "community," you see that [it] is actually ... more a product of conflict than of collaboration: It's an endless struggle by a few talented contributors to clean up the mess left by the numbskull horde.
There may be wisdom in that crowd. There is also a lot of noise. Separating the wisdom from the noise is the real challenge.
See also my previous post, "Getting the crap out of user-generated content".