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 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.

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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.

“People went online using a wide variety of text-only phones, feature phones, and early smartphones with varying capabilities,” Facebook wrote. “In that environment, the demand for internet services like Facebook, Twitter and YouTube outpaced our industry's ability to build versions of our services that worked on every phone and operating system.”

Facebook said it has ended 38 of its 52 partnerships and will shut down those remaining by July.

The tech company has been under scrutiny for its user data-sharing practices since the revelation earlier this year that Cambridge Analytica improperly harvested data from 87 million of its users.

Facebook said in documents that its initial omission of the partnerships was because it had shifted its focus to data shared between apps created on its developer platform — the product area which had been implicated by Cambridge Analytica.

Facebook’s sharing of user data with developers appears to have been less controlled than its data sharing with comparatively well-known device makers and software companies.

Still, lawmakers have voiced concern about the company's data-sharing agreements with Chinese firms.

“The news that Facebook provided privileged access to Facebook’s [application programming interface] to Chinese device makers like Huawei and TCL raises legitimate concerns, and I look forward to learning more about how Facebook ensured that information about their users was not sent to Chinese servers,” Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.) said earlier this month.

Facebook's Cambridge Analytica scandal drew outcry from several lawmakers, ultimately culminating in CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield Facebook to 'restrict the circulation of content' if chaos results from election: report 2.5 million US users register to vote using Facebook, Instagram, Messenger MORE delivering a high-profile testimony in a lengthy Senate hearing.

The more than 700 pages of documents offer a follow-up to questions asked by lawmakers during and after the testimony.

“After initial review, I am concerned that Facebook’s responses raise more questions than they answer,” House Energy and Commerce’s top Democrat, Rep. Frank Pallone Jr. Frank Joseph PallonePharma execs say FDA will not lower standards for coronavirus vaccine Dem chairmen urge CMS to prevent nursing homes from seizing stimulus payments Federal watchdog finds cybersecurity vulnerabilities in FCC systems MORE (N.J.), said Saturday.