Just a quick note for anybody wondering - currently the twitter.com link in the post is broken because the code hasn't been pushed yet. When the link gets a blue image of the Twitter bird for a userhead in the near future, that's a sign that the code has been pushed, and it'll start working without any edits.

(and I just realised that I don't think we have any equivalent change to alt text to specify that. But I'm not sure how to designate it in the alt text, because not all such links will be broken.)