While anyone can clearly see you're wearing Glass, it's not always apparent to outsiders if you're recording video or taking pictures of them. (We tech geeks will know because we'll see the screen is turned on but most people don't know that.) Stealthy photography/video recording is one of the benefits Glass, but one feature that Google has publicly stated it won't allow in official Glass apps (Glassware) is facial recognition — even if it could be used by doctors and hospital staff — because it's too dangerous.

For obvious privacy reasons, allowing facial recognition on Glass would only make the wearable creepy to the public. But whether Google likes it or not, there will always be hackers entrepeneurs that mean business. Case in point: FacialNetwork's Google Glass app "NameTag", which can scan faces and try to find a match in a compiled database of over 2.5 million faces.

With the NameTag app loaded up, Glass's camera can do two things: 1) scan a photo or 2) scan a person's face. If a match is found, NameTag will display info such as a person's social network profiles, interests, relationship status, occupation, etc.