Marketplace had a great piece today on Alessandro Acquisti's work on his Face Matching Algorithms of Dooooom. As in, he takes a photo of the NPR interviewer with his iPhone, and it immediately pulls up everything about the guy.
From a technological perspective it's all fascinating, but from a privacy perspective it's downright terrifying. This is all reflects a lack of citizen and governmental understanding of data. You share some information with your grocery store, get a frequent shopper card, you don't realize how this data is being brokered, merged, sold, to countless numbers of people. Furthermore, a photo you post with some friends at a party, even if you don't tag it-- all you need is one identifiable photo (Driver's license registry?), and BOOM, there it is.
Add this to fraudulent SSL certificates running amok, and I really feel like we're up a creek.
This is a great time to become a security researcher. Grad students, forget all those other CS topics - do security. Or systems. Or both! There are plenty of important problems that need solving ASAP.