Steven M. Cohen points out a very nice protocol for wiki users that can invite careful, respectful collaboration:
[W]ikis can help in that everyone can contribute, there is a "paper" trail, and everyone can read what is going on on a project. I've been working with a colleague on a wiki and we have one rule: No deleting until the issue is discussed F2F or via IM. Edits (using different fonts and colors) are essential to wiki-work. #