A new study by researchers at the University of Warwick is linking the use of Facebook to incidents of violence against refugees.

Karsten Müller and Carlo Schwarz of the University of Warwick found that German towns that had higher incidences of violent attacks targeting refugees also had a corresponding higher rate of Facebook use among the town’s population.
http://thehill.com/policy/technology/402828-study-facebook-use-may-fuel-violence-against-refugees