Among the many interesting points he makes is one on the question of quality:
Quality emerges in weblogs largely as a result of the web of hyperlinks that is weaved by the community of editors. Although it is true that there is no review process prior to publishing, one definitely occurs immediately after publication.
As people read others’ weblogs, they link selectively to the content that they find interesting. Content that has been referenced more often directly obtains more visibility….
Note that these dynamics mirror those of academic publishing: articles that are cited more often are more visible and are read more. This is useful in two respects: it encourages quality, and it makes it more likely that people will find the most relevant documents.