https://www.theregister.co.uk/2018/11/26/facebook_dcms_document_cache_seized/

British MPs have made unprecedented use of Parliamentary powers to send a serjeant at arms to the hotel where the boss of a US software biz was staying to seize potentially damaging documents on Facebook.

The cache allegedly shows internal messages – including from Mark Zuckerberg – that demonstrate the social network actively exploited a loophole in its policies on access to users' friends' data that allowed Cambridge Analytica to walk away with info on 87 million people.