The limitations (and inaccuracies) of traditional data sources like the U.S. Census are well known, so researchers are looking social media to gather the data necessary to draw conclusions about societal movements.
According to an article by Federico Guerrini, "researchers are turning to social networks, using the zillion data produced by users as a tool to monitor recent trends in migration."
Guerrini focuses on the example of a study called "Inferring International and Internal Migration Patterns from Twitter Data," which sourced and mapped 500,000 tweets to track migration in and out of countries.
Guerrini examines the study, not only for the conclusions of the study, but also as an example of researchers are improving on existing methods and harnessing the power of social media. In fact, says Guerrini, "[researchers] believe that combining this method with more classic approaches developed in the social sciences could help significantly improve medium-term forecasts."
FULL STORY: Using Big Data To Understand Migrations

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Balancing Bombs and Butterflies: How the National Guard Protects a Rare Species
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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
EMC Planning Group, Inc.
Planetizen
Planetizen
Mpact (formerly Rail~Volution)
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research
NYU Wagner Graduate School of Public Service