A reminder of how deeply the US government spied on ordinary people, framed as a warning that it likely still does.

• Leaked files revealed a secret NSA program that tapped into people's webcams without their knowledge.
• The program grabbed images from millions of random Yahoo users, snapping a new picture every few minutes.
• Those private images were stored on government servers, and none of the people knew it was happening.
• Without the leak, the spying would probably have stayed hidden forever.

Outlook: The takeaway is to assume any device with a camera or microphone could be watching or listening.