Meet Tin Can, the social network that runs without the Internet
Tin Can is a phone-to-phone messaging app that requires no Internet connection or cell phone service. With roughly the same signal strength of literally two tin cans connected with a string, Katakowski's app can send signals only a couple dozen feet at most.
Stashed in: Teh Internets
Thought this was a joke, but I guess not.
Yeah, it took me two reads to realize they weren't talking about ACTUAL tin cans.