Never before have scientists been able to track how many people migrate and where.

At 1.19 billion monthly active users, or  an astounding 15% of the world's population, Facebook is perhaps the largest voluntary collection of human data ever made. It puts into writing hundreds of actions that previously went unrecorded for masses of people, and we now have studies for which it was previously impossible to create an appropriate sample size. Now a group of data scientists have zeroed in on a trend called ‘coordinated migration,' where at least 20% of the population of one city has moved to another city.

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