Seriously, I’m not sure why we didn’t do North America. Going international in general would multiply the complexity significantly. E.g., we would need to find info on Canadian postal code Long/Lat centroids, population data, etc. I’m sure these are available, but it about doubles the work involved.

The problem with, e.g., tracking those who use meetup is that there isn’t any standard way to find it on the page. We’re trying to set up a process by which a program can take a pretty decent guess at where a blogger is. Livejournal and diaryland were the low-hanging fruit here: often with clear indications of the bloggers local.