Something like reddit commentroversy would be nice as a feature of the site. Sadly it doesn't work on LW, maybe I'll try to look at it and figure out if there is a possible hack to getting working until (if) the feature is implemented here.

A very quick bit of troubleshooting shows that the json load doesn't appear to be occurring, i.e. the $.getJSON apparently doesn't work.

Edit: to be precise, the script bombs out when trying to do anything with '$.getJSON', which perhaps is not available in LW's version of jQuery?

Edit 2: Ah, LW doesn't use jQuery. It uses Prototype. The script would have to be converted. But it does indeed appear that LW exports the needed data in JSON form.