Board Thread:Support Requests - Getting Technical/@comment-35301431-20140507195846/@comment-856287-20140508033626

Ah, I see you have it setup at MediaWiki:Twitter-Widget. The only thing that looks wrong with it is

data-widget-id="TwitterID"

That should actually have an ID there, like this

data-widget-id="313355870273124253"

(That's not a real ID, so it won't work, but you get the idea.)

It should be generated along with the code on Twitter.com. If you just copied the widget code from somewhere (it looks like you copied off the help page where they subbed in "TwitterID" for the real ID), it won't work; you need the unique ID that Twitter generates for you when you create the new widget.