Board Thread:Support Requests - Community Management/@comment-4664963-20140128084218/@comment-1038387-20140128164320

Iggyvolz wrote: If you want to have private content, you'll have to host your wiki on your own. If you'd like instructions on that, message me. (Note that hosting your own wiki won't include Wikia-created features like forums, message walls, new theme, etc.)

Also, in most (if not all) cases, it isn't free.