You may have noticed a lot of glyphs popping up lately. Glyphs are generally used with augmented reality apps, as a sort of key; taking a symbol of some sort in it’s analog form and converting it via webcam to a digital “key” which then allows the use to interact with the software online.
Here is a GE video showing you how augmented reality can work:
There are other augmented reality sites which use the horizon, your position and some other factors to show you nearby restaurants, bars, shopping, even other people on Twitter and such. Probably not going to amount to much, but interesting as a concept anyway.