We’ve read a lot of shocking things about the National Security Agency’s spying practices but this new revelation might be the most shocking one yet. The Guardian reports that the NSA has helped British spy agency GCHQ capture and store millions of images from Yahoo users’ webcam chats with one another, even though most of the users in question weren’t targets of intelligence surveillance programs. Yahoo has, of course, denied any prior knowledge of this program’s existence and has condemned it as “a whole new level of violation of our users’ privacy.”