Yellow Arrow is a unique attempt to allow people to leave their mark on the world for others to see. A yellow arrow with a unique code is placed on a object somewhere and the code is sent via a text message to the Yellow Arrow system. If you ever run across one, just send a text message to the Yellow Arrow system with the arrow's code and the poster's message will be sent back to you.
It looks like it's got some fun potential, and will probably have a nice underground following.
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