In The Obervatory it looks like this:
but in The Pod Bay it's only a url.
I think the Pod Bay used to show tweets as tweet-like, just like it shows photos of Matt Damon even when you don't want them. But now that function seems to be turned off, even though XKCD has unthrottled auto-pipeline privleges of full-size cartoons.
Is this so? If so, why?