Board Thread:Support Requests - Designing Your Wikia/@comment-24658545-20141016184632/@comment-452-20141016211041

Yes. Wikia Staff have told me that it is permitted to add content to the sidebar - but not to displace ads or remove default content. Excessively long additions which would move the default content all the way off the page are also not allowed.

Examples:
 * http://tardis.wikia.com/Special:Random (2 additions)
 * http://finalfantasy.wikia.com/Special:Random
 * http://spongebobfanon.wikia.com/Special:Random