Why are people just now bringing up privacy concerns with facebook? We've known about this for years. In fact, in 2012, the Obama campaign bragged about their gathering of personal information from facebook and twitter users to win the 2012 election. Read more here:
https://reason.com/archives/2018/03/23/cambridge-analytics-dust-up-reveals-lawm

My point is, this has been an issue for a very long time. Privacy is dead. We need to be aware of our voluntary surrender of personal data and take some responsibility. This article outlines it in detail:
https://steemit.com/life/@workin2005/privacy-is-dead-and-we-have-no-one-to-blame-but-ourselves