Facebook revealed to Congress late Friday that it shared user data with 52 hardware and software-making companies, including some Chinese firms.

The new acknowledgement came as a part of a more than 700-page document dump to the House Energy and Commerce Committee late Friday evening. The committee released the information publicly on Saturday.

Some companies on the list of 52 firms had previously been reported by The New York Times, including device-makers, telecommunications companies and software firms.

The list featured major tech companies like Apple, Amazon, BlackBerry and Samsung. Other firms featured on the list include Alibaba, Qualcomm and Pantech.

But the list also includes four Chinese firms that U.S. intelligence has flagged as national security threats — Huawei, Lenovo, Oppo and TCL.

Facebook said it shared data with the companies in an effort to improve its integrations and user experience across platforms and devices, noting that its partnerships were established before smartphones running on Apple’s and Google’s high-powered operating systems were as ubiquitous as they are now. – READ MORE