10. A method of enabling desirable bonus features of application code of an application by proximate social interaction among first devices initially in a susceptible state, second devices in a susceptible state, and third devices in an infectious state, the method including: at least initiating delivery of application code including a locked desirable bonus feature to the first devices and second devices in a susceptible state; and at least initiating delivery of application code for the third devices either in the infectious state or triggered into the infectious state after delivery; wherein transition of application code from the susceptible state to the infectious state is accompanied by unlocking of the locked desirable bonus feature; detecting proximate interaction of application code running on any of the third devices with application code running on any of the first devices; and at least initiating application code running on respective first devices to unlock the locked desirable bonus feature and to transition the first devices from the susceptible state to the infectious state, whereby the first devices are enabled to infect the second devices and unlock the locked desirable bonus feature on the second devices.
10. A method of enabling desirable bonus features of application code of an application by proximate social interaction among first devices initially in a susceptible state, second devices in a susceptible state, and third devices in an infectious state, the method including: at least initiating delivery of application code including a locked desirable bonus feature to the first devices and second devices in a susceptible state; and at least initiating delivery of application code for the third devices either in the infectious state or triggered into the infectious state after delivery; wherein transition of application code from the susceptible state to the infectious state is accompanied by unlocking of the locked desirable bonus feature; detecting proximate interaction of application code running on any of the third devices with application code running on any of the first devices; and at least initiating application code running on respective first devices to unlock the locked desirable bonus feature and to transition the first devices from the susceptible state to the infectious state, whereby the first devices are enabled to infect the second devices and unlock the locked desirable bonus feature on the second devices. 16. The method of claim 10 , wherein proximate interaction includes relayed communication through an access point coupled wirelessly directly to a respective pair of infectious and susceptible devices.