Mark Zuckerberg will testify in front of Congress today. He’s expected to address the way Facebook protects information about its users. But the current Facebook scandal is really a story about data, and a data economy that’s out of control. Over the course of this week, Marketplace Tech will look at different aspects of the data economy to understand how we got here. Today’s focus: privacy. Marketplace Tech host Molly Wood spoke with Mark Surman, executive director of the Mozilla Foundation, about how sharing personal information in exchange for free services came to be.

Mark Zuckerberg will testify in front of Congress today. He’s expected to address the way Facebook protects information about its users. But the current Facebook scandal is really a story about data, and a data economy that’s out of control. Over the course of this week, Marketplace Tech will look at different aspects of the data economy to understand how we got here. Today’s focus: privacy. Marketplace Tech host Molly Wood spoke with Mark Surman, executive director of the Mozilla Foundation, about how sharing personal information in exchange for free services came to be.