Often groups collaborate on a document by "pushing" it out to each member - emailing a file that each person edits on his or her computer, and some attempt is made to coordinate the edits so everyone's work is equally represented. But what happens when two people think of the same idea and include it in different ways in their respective copies of the file, or when one group member misses an agreed upon time to finish their changes and pass on the file to the next member? Who decides what to do? Using a wiki "pulls" the group members together to build and edit the document on a wiki page, which strengthens the community within the group, allows group members with overlapping or similar ideas to see and collaboratively build on each other's work. It also allows all group members immediate, equal access to the most recent version of the document.
From the Using Wiki in Education Blog.
Collaborative authoring is the strength of a wiki tool like
Other possible uses can be found at Possible Uses of this Site, where everyone at IUB can contribute their ideas.