"ultranoir recommends Google Chrome 9+ rather than your Safari version
to fully enjoy the Nouvelle Vague experience." I have WebGL enabled on safari and everything worked, but this annoying message stayed over the page the entire time and made it unusable. Rather annoying, as there isn't any reason to restrict this to chrome if Safari has WebGL enabled.
The best thing about this is that I now know that these Twitter visualisations are called "Twitter walls". I've spent the last week working on my own, and now I know that there are already many in existence. But I like my own :-)