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 list of these partners includes major American tech brands such as Apple, Amazon and Microsoft, along with South Korean tech giant Samsung and China-based companies Huawei and Alibaba. Not all of the companies are device makers; some make operating systems or other software. Facebook has ended 38 of the 52 partnerships and plans to soon end seven more. The acknowledgment, which came in more than 700 pages of replies to the House 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.