Facebook, Twitter and Instagram have revoked access to their data to an analytics firm accused of selling information that allowed US police to track activists and protesters.
The American Civil Liberties Union (ACLU) said Chicago-based Geofeedia had allowed police to "sneak in through a side door" to monitor protests.
Geofeedia said it was committed to the principles of personal privacy.
It comes amid growing concern about government access to social media.
ACLU said Geofeedia had been marketing its services to police agencies to help track activists using location data and social media posts.
The group said it had seen internal documents in which Geofeedia said that it "covered Ferguson/Mike Brown nationally with great success," referring to protests which erupted in 2014 after an unarmed African-American man was shot dead by police.
(Score: 0) by Anonymous Coward on Thursday October 13 2016, @03:17PM
Kinda like posing as members of a church and having sex with some of them to spy on them doesn't require a warrant either. If they cared about their privacy they wouldn't have let any undercover informants in to their lives, right?