Octopus (theoctopusapp.com) An app to sell anything. Inspired by the Octopus payment system in Hong Kong, I've reasoned that technically, why can you buy or se

Octopus (theoctopusapp.com) An app to sell anything. Inspired by the Octopus payment system in Hong Kong, I've reasoned that technically, why can you buy or sell anything with your mobile device.