This is possibly because we started our index crawling from one Australian (who lived in the UK for a bit) and one Chinese person so there is most likely a bias

This is possibly because we started our index crawling from one Australian (who lived in the UK for a bit) and one Chinese person so there is most likely a bias towards AU, UK and HK at this early stage of our crawling. As we hit a more critical mass this will even out and most likely become a typical US weighted result in Twitter.