I just asked my first question on german.stackexchange.com and I was a little bit surprised to note that it had been marked as Community Wiki.
What are the criteria here for Community Wiki questions? How do they differ from Stack Overflow?
Questions should be community wiki if they are asking for big lists without objective criteria for finding the right answer. Such questions encourage poll-style voting. There should be no difference between community wiki here and on StackOverflow.
Note that, as Dori says, polls are still discouraged.