Mass collaboration is a form of collective action that occurs when large numbers of people work independently on a single project, often modular in its nature.
Many of the web applications associated with Bulletin boards, or forums can include a wide variety of tools that allows individuals to keep track of sites and content that they find on the internet.
(Smaller scale collaborations might be conducted without discussions especially in a non-verbal mode of work - imagine two painters contributing to the same canvas - but the situation becomes increasingly problematic as more members are included.)
Although the only widely successful examples of mass collaboration thus far evaluated exist in the textual medium, there is no immediate reason why this form of collective action couldn't work in other creative media.
Music is also a possible medium for mass collaboration, for instance on live performance recordings where audience members' voices have become part of the standard version of a song.
The sudden and unexpected importance of the Wikipedia, a free online encyclopedia created by tens of thousands of volunteers and coordinated in a deeply decentralized fashion, represents a radical new modality of content creation by massively distributed collaboration.