As internet use grew wider and social media sites proliferated, quiet but urgent voices began to warn that we were giving too much of ourselves away. But the exchange of privacy for free goodies seemed fair enough to most - or at least the skyrocketing growth of Facebook and its counterparts indicated.

The parallel explosion of public surveillance cameras and law enforcement license plate readers was greeted with more or less the same collective shrug. They make us safer. Most of us have nothing to hide.

The Cambridge Analytica scandal has finally given pause to even to the most indifferent. What is our information being used for, and who's paying for it? How has our identifying data gone from buying cheerful digital farm animals to swaying world events? Is it too late to put on the brakes?

Join us for an evening of our ongoing series This Is Now with Angie Coiro, featuring Ars Technica journalist Cyrus Farivar, author of Habeas Data: Privacy vs. the Rise of Surveillance Tech. Knowledge of new tech and the efforts to protect consumers from its rougher edges will definitely make it worth your time.