https://thenextweb.com/facebook/2018/07/03/facebook-user-data-major-companies/

Over the weekend, Facebook revealed it had partnerships with 52 organizations with which it shared user data, possibly without users’ consent.

Facebook disclosed the partnerships in a 700-page manifesto to Congress’s House Energy and Commerce Committee. Some of the partnerships had already been uncovered, with the revelation last month of agreements with Apple, Amazon, Samsung and other device manufacturers. In those cases, Facebook released a counterstatement saying releasing data to hardware makers at the time was the only way mobile users could have the full Facebook experience, as the app itself didn’t exist.