Facebook revelations: what is in cache of internal documents?

Roundup of what we have learned after release of papers and whistleblower's testimony to MPs

Facebook has been at the centre of a wave of damaging revelations after a whistleblower released tens of thousands of internal documents and testified about the company's inner workings to US senators.

Frances Haugen left Facebook in May with a cache of memos and research that have exposed the inner workings of the company and the impact its platforms have on users. The first stories based on those documents were published by the Wall Street Journal in September.