Thread:Dchallofjustice/@comment-1398253-20130620002742/@comment-1398253-20130713113433

Found out why. Quote from an email Wikia sent me, and which you also should have received. Many users noticed recently that Twitter widgets have stopped working on a number of wikis. Twitter's API was changed back in March of this year, and Twitter began to urge users that were using their 1.0 version of their API to switch to Twitter Timelines. It seems, now, that Twitter has finally retired it's old API and is only supporting the new Timeline API.

You can read the discussed change on Twitter's DEV site. Wikia's Help page has also been updated with step-by-step instructions on how to set up the new Timeline.