https://www.vice.com/en_us/article/3azegw/amazon-is-spying-on-its-workers-in-closed-facebook-groups-internal-reports-show

Amazon is monitoring the conversations of Amazon Flex drivers in dozens of private Facebook groups in the United States, the United Kingdom, and Spain, according to an internal web tool and reports left on the open internet and viewed by Motherboard. According to the files left online, Amazon corporate employees are getting regular reports about the social media posts of its Flex drivers on nominally private pages, and are using these reports to diagnose problems as well as monitor, for example, drivers "planning for any strike or protest against Amazon."

Among the files left online is a document called “social media monitoring” that lists closed Amazon Flex Driver Facebook groups and websites across the world, as well as open Flex driver Subreddits, and the Twitter keyword "Amazon Flex."  Forty three of the Facebook groups are run by drivers in different cities in the United States.