Do you use dropdrop?
What is dropdrop?
dropdrop lets you leave messages and photos where you travel, for others to discover. Download dropdrop for iOS, and connect with your local community.
A drop is a message or a photo that you leave at your current location. Other people can see drops you leave behind, and you can discover drops near you. Everything on dropdrop is centered around location, so drops are relevant and timely. Discover and share drops with those around you.