BuzzFeed noted that the memo was written almost immediately after a man was shot to death while streaming live video of himself on Facebook Live - one of several gruesome online incidents that have demonstrated the dark side of a connected world. Criticism of Facebook deepened after reports that Russian operatives used its networks to spread propaganda during the 2016 U.S. election. And reports this month that Cambridge Analytica, an outside firm linked to President Donald Trump's 2016 campaign, improperly obtained and exploited data from millions of users has thrown the company into crisis.