I am seeing this term coming up at times. And I had been asked if I wish to do a wiki once. Seems that I should start to get to know something about the term. Hope that someone could help ...
Here at EL&U, a question will/should be made into a community wiki when there are many right answers; for example, "what words are commonly mispronounced by literate people who read them before they heard them?".
We have provided some additional guidance at the blog:
Most of the time, you should be asking yourself “How can I improve this post so that community wiki isn’t needed?” Community wiki is like a cheese knife: it is a specialized tool to be used sparingly, and only in very specific circumstances.