Bill Ferriter offers some useful advice for teachers who are interested in using wikis for class projects but are concerned about students posting inappropriate material. In the end, he says, the risk is worth the reward:
My wiki for this year currently has over 200 pages of content created by my kids that have literally been revised thousands of times. Most days, I've got dozens of kids online interacting with content even though most of the work on our wiki is ungraded! ...
My tolerance for risk--and the tolerance for risk demonstrated by my administrators--has grown since starting to work with digital tools. We value the potential in teaching kids to communicate and collaborate online and recognize that we'll need to rethink the kinds of risks we're willing to take--and the kinds of lessons that we typically deliver--if we're going to be successful.