Neat idea. Here's another I've been stewing on for a while: give every wifi point a wall/chatroom that's only writable (and maybe, only readable) by people usin

Neat idea. Here's another I've been stewing on for a while: give every wifi point a wall/chatroom that's only writable (and maybe, only readable) by people using the same public (behind-NAT) IP address. One problem with SSIDs for messaging is how their display is often truncated. (iOS's wifi screens are a bad offender here.)