Wiki science/How to Maintain a Wiki
People are the most important thing. So maintain a vibrant user base.
Some wikis have one or more pages specifically dedicated to listing actions to take (rather than just discussing some topic). Some things only the wiki maintainer can do:
While other things could be done by anyone:
Sometimes the list isn't maintained on the page itself, but on the BackLinks to that page (using the category system)
In particular, FAQs work well on Wiki because there is collaboration between people who add questions to the FAQ and people who add answers to the FAQ.