When should questions on Meta Stack Overflow be community wiki? I have seen a lot of non-community-wiki questions here that would have been community wiki on Stack Overflow. Obviously the rules are going to be different here, but what are those rules?
When you want to have a question that has a collection of information from the entire community. For example a community edited list of some sorts. (just like CW's were supposed to be)
Community Wikis have been misunderstood for a long time now. Here's a post that's a prime example of what a CW post should be.
So any post that could possibly contain information that the community decides on and edits. Think of it as a wiki article (sorta)