User blog comment:Brandon Rhea/Why Social Media is Important For Communities/@comment-4129195-20160603091455/@comment-5811199-20160603140130

Personally I feel like it brings more audience and reinforces the content. Users who aren't aware of the wiki may be exposed to one or two tweets or posts about it - and they might take a peek at the wiki to see.

It also is a place less formal and more creative - you could have a random trivia post every once in a while, or put up a poll on a tweet with a difficult question for users to test their knowledge.