The American Civil Liberties Union recently uncovered evidence that led Twitter, Facebook and its Instagram subsidiary to stop sharing data with Geofeedia, a firm accused of improperly collecting social media data on protest groups, and sharing that information with numerous law enforcement agencies. Geofeedia, a developer of location-based analytics, had been marketing its technology to law enforcement agencies. It was used for such purposes as monitoring Black Lives Matter protests in Ferguson, Missouri, and Baltimore, Maryland.