In 2007, nine major tech companies, including Google and Yahoo!, began cooperating with what they thought was a limited government surveillance program.

They didn’t know the NSA was hacking their internal networks, copying an unprecedented share of global internet traffic — and collecting the data of millions of Americans.

In United States of Secrets: Part Two, FRONTLINE explores Silicon Valley’s secret role in the massive NSA dragnet revealed by Edward Snowden.

How much of your data goes from tech companies into the hands of the government? How does that data collection happen? Are any companies fighting back? And what does it all mean for your privacy?

Join us for a live chat with United States of Secrets: Part Two writer and producer Martin Smith and cybersecurity researcher Ashkan Soltani, who contributed to the Pulitzer Prize-winning Washington Post coverage of the Snowden files.

Lorenzo Franceschi-Bicchierai, cybersecurity reporter at Mashable, will serve as guest questioner.