User blog comment:Brandon Rhea/Why Social Media is Important For Communities/@comment-5175866-20160603023922/@comment-3474542-20160603165539

I'm going to double post, just so this doesn't get lost in the advice specific to the OP's wiki.

Wikis that are based on a topic that doesn't get "new content" regularly can still generate content for social media, you just have to recycle without making it obvious, and make sure your posts are relevant to your wiki or it's topic.

Some good ways to engage your audience:
 * Celebrate awards and recognitions given to the wiki and the topic of the wiki.
 * Remind people of important dates, anniversaries of an item's release dates, important episodes, and important dates in-universe (a character's birthday, etc). You can even celebrate the creation of articles on the wiki.
 * Sponsor contests encouraging people to submit artwork related to specific parts of your wiki (be sure to comply with relevant laws, you don't want to get anyone into legal trouble!)
 * Create events related to the wiki (chat nights, editing sessions, Q&A sessions with artists, trivia contests, etc).
 * Make polls about favorite topics (actors, scenes, game strategies, etc)
 * Answering random questions on social media using the wiki's account.
 * Expand your audiences with multiple languages! Either learn a particular language, try asking for help translating from someone who is fluent in more than one language.