Social radar per 'circle of friends' with Google Glass

Imagine that with Google Glass at each location, party, reception, theme park, concert, sports event... you can detect whether your Google+ 'contacts' are in the area. This is possible per Google+ Circle (family, friends, acquaintances, tracking, business, colleagues...)

You can then send a message or photo through voice control or record a video and share it with them or be navigated to the one you want to meet.