I think it would be pretty interesting to have a nano messaging system between addresses. Text could be encoded in the amount field using super tiny send transactions. You would be able to direct message any address (using secure messaging - the message would be encrypted using both the sender and the receiver's nano address, and could be decrypted with the seed of either) or publicly message the entire community (unencrypted messages sent to any commonly agreed upon message board, such as the burn address).
Any thoughts? Is this technically feasible on the nano protocol and on wallet applications/websites?