Marc Lavallée wrote:
However, the only other wikis I recall visiting (and a LOT) are the C2.com wiki and the Wikipedia, which are the two biggest wikis I know, were never affected by any such problem, as far as I remember.
Because Wikipedia has a login, permissions and reviewers.
actually you dont have to login to edit wikipedia pages at all. they do track the ip address of those who make changes and can temporarily block that ip from editing, but that is pretty rare.