Six Overground introduces dropdrop 1.1, their popular social networking app for iOS devices. dropdrop lets you leave "drops" where you travel for others to discover. A drop is a message or photo placed at a specific location in the real world. Missed that cute stranger on the train platform? Leave an anonymous drop for them to find when they return. Like user-generated geofences, you determine the size of the drop, its duration, and who can see it. dropdrop is Free and can be downloaded from iTunes.