As a purely data-driven approach, we anticipate continued refinement of this approach through the incorporation of more data (in the form of wider coverage of Twitter users and their associated tweets). We are also interested to combine the purely content-based approach here with social network inference based approaches for combining location evidence of social ties in the estimator. We are also interested to further explore the temporal aspect of location estimation, to develop more robust estimators that can track a user’s location over time.