The difference lies in the degree of efficiency provided by the combination of a permanently recording device with a database. Labeling your environment nowadays means taking out your cellphone, photograph the scenery, upload it online and do some research about all people visible. This takes too much time for someone to seriously exploit it. Google Glass on the other hand is supposed to do all this stuff in real time and label and upload the currently recorded data too even from complete strangers you don't know or care about but others do. Incidents, that would go unnoticed otherwise would be immediately escalated to the worst possible level in Google's intent to make the info available to everyone who might be interested. Like "Watch photos of Steve getting drunk on a distant mountain resort where he hoped nobody knew him".