Concept wiki
A concept wiki is a type of wiki with the purpose of collaboratively building a shared, collective, conceptual body of knowledge or understanding.
A concept wiki differs from a document wiki, such as Wikipedia, in that it is much less formal, more open to experimentation and exploration of ideas, and is also more collaboratively inspirited. Whereas something like Wikipedia endeavours to maintain a single, coherent point of view (such as Wikipedia:Neutral point of view)), a concept wiki is much more open to accepting the expression of many varied and diverse points of view.
Concept wikis are more akin to: A continuous brainstorming session, a concept map, a mind map, a community, an open forum, a marketplace of ideas, an open source project, a democracy, an ongoing conversation or dialogue, etc.