https://medium.com/@chrissaad/do-not-deletefacebook-because-of-cambridge-analytica-e8a2eec44730 >The ability to log into new apps with your Facebook or Google account and share some of your data is called data portability. >Data portability has become so fundamental to the way the open Internet works that it is taken for granted by most users and it is even enshrined in a new European law known as GDPR.