Electronic Message in a Bottle Concept

A while back I had an Idea for a message( or data ) relay system application. Most people have a wireless compatible devices weather its a DS or a PSP or a cellphone. They use Radio waves form things likes wifi to bluetooth. Each wireless device has their own physical address. Well my Idea is for a Message in a bottle type program that lets you create a message for a friend or just any one intrested in it. The program then runs in the background of your devices and looks for any one else running it too. When ever you get in range of a person running the same program your program sends(copies) that person the message and any other messages you have looking for their rightfull owner. And that person sends(copies) you his. Pretty much swaps messages. To prevent messages from overfilling they can have a experation date, or a online database can be used to connect too periodicly to check if messages have reached their target or expired. The cool possibilities i see with this program is that you could send pictures or even data that way. And also have a viewer aplication showing the message traffic so that people can see the interactions happening as they walk by and all the exchanges at their current location. Also a history feature would be intresting to see how your message got to you. Imagine it as a chatroom and a p2p program combined but more of a relay. And also kinnda like a virus. This kind of message system would be very fun at a game convention or a place with a lot of people that might want to say some thing to some one, but not be able ot personaly walk to them. Imagine your message being copied over to one person and you both walk the upset directions then he meets anthoer person and now your message is being sent out by 3 (counting you) people that are walking around and you have a higher chance of getting it to your friend that you some how dont know where he is at the moment. (This method is very viral persay.) lol or you could just call him and tell him to get his ass over here. Its more of a fun social interaction aplication then a fleshed out message system like a cellphone or email.

Release the bottle onto the ocean of wireless signals!