Twitter as a Source of Global Mobility Patterns for Social Good
  Data on human spatial distribution and movement is essential for understanding and analyzing social systems. However existing sources for this data are lacking in various ways; difficult to access, biased, have poor geographical or temporal resolution, or are significantly delayed. In this paper, we describe how geolocation data from Twitter can be used to estimate global mobility patterns and address these shortcomings. These findings will inform how this novel data source can be harnessed to address humanitarian and development efforts. 
Mark Dredze and Manuel Garc\'ia-Herranz and Alex Rutherford and Gideon   Mann
cs.SI physics.soc-ph stat.ML