Henry Jenkins: 'The kinds of communities I discussed in the book are what Cory Doctorow calls "ad-hoc-cracies." They emerge quickly in response to shared interests and concerns. They last as long as people need the community to work through a common problems or query. They vanish when they are no longer useful to their members. They are radically interdisciplinary or I'd prefer, "undisciplined," in that they draw together people with many different expertises and they deploy social networks which observe few of the barriers to interaction we experience in the physical world to bring people together who should be working together. They develop informal yet very powerful systems for vetting information and for carrying out deliberation.'