Board Thread:Support Requests - Community Management/@comment-32935159-20171122042225/@comment-26437440-20171124060726

Some wikis are actually official, there's just no way to exactly prove it at a first glance with the new nav bar design. There used to be a little symbol that went in the wiki's wordmark (iirc it was like "[ ] WIKIA"). Though I'm sure Wikia knows which of the wikis are the real official ones.

I specifically remember seeing the symbol on The Witcher wiki before the redesign, and here's a blog discussing the (then) new and official Shadow of Mordor wiki.