Traces magically float in real world places - use your camera to grab them all.
Traces has been featured by Apple and got 5 stars reviews by Wired, New Scientist, GigaOm and CNET. This is how they liked Traces:
***** “This is an absolutely cracking idea” • New Scientist
***** “It’s as if the messages have been etched on the air” • Wired
***** “Geolocation meets messaging meets augmented reality meets tech brains everywhere exploding.” • GigaOm
***** "Leave digital surprises in real-life locations" • CNET
Continued use of GPS running in the background can dramatically decrease battery life.