So when Balaban first announced he had built an app that let folks use Glass for facial recognition, Google reacted harshly.

“I’d be lying if I said I was surprised,” he said.

The company said it wouldn’t support programs on Glass that made facial recognition possible — and changed its terms of service to ban them. But that hasn’t stopped techies like Balaban from building these services anyway.

And now, there are all sorts of things developers are doing with Glass that were not built into the original design.

Michael DiGiovanni created Winky — a program that lets someone wearing Google Glass .

Marc Rogers, a principal security researcher at Lookout, realized he could hijack Glass if you could trick someone into taking a picture of a malicious QR code — a kind of square-shaped bar code that can send a computer directly to a website.