Carl Bernstein

In the John Paul II days, Cardinal Joseph Ratzinger had the advantage of staying in his cupboard - the Congregation for the Doctrine of the Faith - exchanging views only with the Pope, and speaking publicly only through carefully written missives on doctrinal issues.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.