I would like to implement a feature in a digital community that would allow users to send chats to other users. The target application is mobile phones, and the idea is that they would use these chat features to communicate privately (either group or pm) instead of using an external chat application like Touch or Kik (or whatever the craze is this week).
However, in order to do that, I would need to replicate a number of the features these other apps have, which in order to remain appealing would almost certainly have to include sending pictures, perhaps video. Even though the community is built up around a game, it would still require these social features to remain on the users' radar.
I certainly don't want my users to feel like they're spied upon. But in an age where kids are getting felony charges for sexting eachother, I certainly wouldn't want to get accused of facilitating child pornography because a couple of my underage users hooked-up. And honestly, considering I met my wife on an online game myself, I wouldn't necessarily want to discourage adult conversations over such a communications channel.
How can I balance legal issues and rule obedience with users' privacy over a 'private' communication channel between two users?