Yesterday, social media surveillance became a very real problem for Facebook and Twitter. An ACLU report revealed a CIA-funded tool called Geofeedia was being used by police to track data from Facebook, Twitter, and Instagram to aid in investigations. Documents show Baltimore police used the tool, called Geofeedia, during protests after the death of Freddie Gray, even feeding Instagram posts through a facial recognition system to find protestors with outstanding warrants.

Facebook and Twitter were quick to revoke Geofeedia’s access to social feeds — effectively shutting down the current version of the tool — but its broader implications are harder to dismiss. Facebook and Twitter can control direct access to their data, but they have…

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