Hi Htonl,
I was very impressed by your maps of the distribution of South Africas languages derived from the census data. I am wanting to do some ecological correlations between sexual partner concurrency rates, HIV and language groups and wondered if you would like to collaborate/coauthor this and be able to share your census language spreadsheets?  
Many thanks
Chris Kenyon
UCT Dept Medicine
chriskenyon0@gmail.com