What started as an experiment in the fall of 2004 is now a major online presence with an estimated 40 million monthly users. Kevin Rose's concept of a user-controlled community that votes to \digg up what links that they collectively deem important, or bury down those of little interest, has been successful in part because of the company's ability to adapt and add new features. [via Mashable’s History of Digg ]

Social machine type: