My thoughts were to use TNet in a different setup than norm- one player would play in more of a solo mission where onlookers can watch and interact with their smartphones. For example, if a user is playing a flight simulation game, onlookers could send taunts, launch missiles at the player, even help the player in some fashion, all from their smartphone's browser in a simple HTML interface. They'd basically have a button or two that would send a message to TNet, webserver, socket server, etc.
That make more sense?