To benchmark our method, we reimplement two recently-published state-of-the-art methods: (1) the KL-divergence nearest prototype method of Roller et al. (2012) based on KD-tree partitioned grid cells, which we denote as KL; and (2) the multinomial naive Bayes city-level geolocation model of <cite>Han et al. (2012)</cite> , which we denote as MB.