Over the past two months, Google has started letting people around the world choose what data they want to share with its various products, including Gmail and Google Docs.

Amazon recently began improving the data encryption on its cloud storage service and simplified an agreement with customers over how it processes their information.

And on Sunday, Facebook rolled out a new global data privacy center — a single page that allows users to organize who sees their posts and what types of ads they are served.
https://www.nytimes.com/2018/01/28/technology/europe-data-privacy-rules.html

Also see:

Facebook reveals privacy principles for first time, helps users control access
Facebook has published its privacy principles for the first time and will roll out educational videos to help users control who has access to their information.

As the company prepares for the impact of new European Union data protection laws, it announced on Monday that users will be shown how to manage the data that Facebook uses to show them ads, how to delete old posts, and what happens to the data when they delete their account.
https://www.theguardian.com/technology/2018/jan/29/facebook-reveals-privacy-principles-for-first-time-helps-users-control-access