It would be nice if Twitter didn't add a massive useless preview window to the tweet when linking to a Gist. It's GitHub's fault for using the author's avatar as an Open Graph (ogp.me) image:
<meta property="og:image" content="avatars2.githubusercontent.com/u/1505226?s=40" />
*sigh*
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It gets the viz from the last link in your tweet. If you change the link order it would work.
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