From its earliest days, Silicon Valley has been animated by near-absolutist understanding of free speech. Other than exceptions for fraud, pornography or specific threats, the prevailing view among many tech platforms has been to allow pretty much anyone to post pretty much anything. These sensibilities are even enshrined in American law, which gives companies broad immunity from prosecution for what their users post.

But now, for good reason, the absolutist ethos is over.

Over the past two years, pressed by lawmakers and the media about the harm caused by misinformation, state-sponsored propaganda and harassment, tech platforms have begun to radically overhaul their attitudes about what people can say online and how they can say it.
https://www.nytimes.com/2018/07/25/technology/tech-companies-facebook-twitter-responsibility.html

Also see:

Facebook's grim forecast: privacy push will erode profits for years
Facebook Inc's shares lost as much as a quarter of their value on Wednesday after executives said that profit margins would plummet for several years due to the costs of improving privacy safeguards and slowing usage in the biggest advertising markets.
https://uk.reuters.com/article/us-facebook-results/facebooks-grim-forecast-privacy-push-will-erode-profits-for-years-idUKKBN1KF2U5

Facebook Suspends Analytics Firm Over Surveillance Concerns
Facebook is launching an investigation into whether Crimson Hexagon’s collection of public user data was a violation of its data policies.
https://threatpost.com/facebook-suspends-analytics-firm-over-surveillance-concerns/134286/