Whether it's Facebook or Google or smart speakers that may be overhearing every word you say, there are lots of companies that you know are a risk to your privacy. But then there are the hundreds of companies you haven't heard of making billions of dollars buying and selling incredibly detailed dossiers — about everybody. These are data brokers. Host Molly Wood talked about that business with Michelle Richardson, director of the Data and Privacy Project at the Center for Democracy and Technology.

Today's show is sponsored by Pitney Bowes and the University of San Francisco.