Wikia has a great support system, but newcomers and Admins alike would have lots of similar questions about the system, configuration, graphics, layout, or any other questions that could be quickly answered by the community if there was a central place to find these questions.
We all know the concept of forums, but StackExchange (remember StackOverflow? or MathOverflow?) have started a new system where questions can be asked, found, answered and sorted very effectively, and its even better than Yahoo Answers.
The results are fast and accurate. Great users get reputation, and hence more rights. The system has really been a success and with a little bit of YOUR help, we could have a StackExchange dedicated to Wikia and your wiki questions!