Facebook offers fresh detail about its ties to dozens of outside companies in more than 700 pages of new data turned over to Congress

Facebook shared user information with 52 hardware and software makers, including some based in China, under agreements designed to make its social media platform work more effectively on smartphones and other devices, the company said in information furnished to Congress late Friday night.

The acknowledgment, which came in more than 700 pages of replies to the House Energy and Commerce Committee, is the fullest to date regarding reports that Facebook shared user data with some companies for years after it stopped doing so with most app makers. Some of the partnerships continued into this year, and some continue to this day, the documents say.