I think you could, check out GNUnet, seriously. Those guys have been laboring away for a long time to produce a platform for anonymous and encrypted communicati

I think you could, check out GNUnet, seriously. Those guys have been laboring away for a long time to produce a platform for anonymous and encrypted communication. GNUnet can be used to build a darknet of any sort: P2P chat, a social networking application, email, you name it. Brilliant people are plugging away at it to build a platform for people with less knowledge of cryptography (like me) to build this sort of stuff on top of.