Wikis have the potential to be fantastic collaborative learning tools, but they need to be overseen by someone who's watching the History button, to ensure any changes to text are made in good faith, and not for malicious purposes.
The fact that anyone can alter the content on web-based Wikis in the public domain means they aren't reliable secondary sources of information, however high they might appear in search engine results.
This week's dodgy edit comes courtesy of the British Conservative Party, who altered the death of a grand master, in order to score a cheap political point. The BBC video below explains all.
Tories admit to Wiki-alteration