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. Such projects typically take place on the internet using social software and computer-supported collaboration tools such as , which provide a potentially infinite hypertextual substrate within which the collaboration may be situated.
Modularity enables a mass of experiments to proceed in parallel, with different teams working on the same modules, each proposing different solutions. Modularity allows different "blocks" to be easily assembled, facilitating decentralised innovation that all fits together.
Mass collaboration differs from mass cooperation in that the creative acts taking place require the joint development of . Conversely, group members involved in cooperation needn't engage in a joint negotiation of understanding; they may simply execute instructions willingly.
Another important distinction is the borders around which a mass cooperation can be defined. Due to the extremely general characteristics and lack of need for fine grain negotiation and consensus when cooperating, the entire internet, a city, and even the global economy may be regarded as examples of mass cooperation. Thus mass collaboration is more refined and complex in its process and production on the level of collective engagement.
Although an online discussion is certainly collaborative, mass collaboration differs from a large forum, email list, bulletin board, chat session or group discussion in that the discussion's structure of separate, individual posts generated through turn-taking communication means the textual content does not take the form of a single, coherent body. Of course the conceptual domain of the overall discussion exists as a single unified body, however the textual contributors can be linked back to the understandings and interpretations of a single author. Though the author's understandings and interpretations are most certainly a negotiation of the understandings of all who read and contribute to the discussion, the fact that there was only one author of a given entry reduces the entry's collaborative complexity to the discursive/interpretive as opposed to constructive/‘negotiative’ levels
From the perspective of individual sites of work within a mass collaboration, the activity may appear to be identical to that of . In fact, it is, with the exception being the implicit and explicit relationships formed by the interdependence that many sites within a mass collaboration share through hypertext and coauthorship with differing sets of collaborators. This interdependence of collaborative sites coauthored by a large number of people is what gives a mass collaboration one of its most distinguishing features - a coherent collaboration emerging from the interrelated collection of its parts.