Well, there's nothing properly developed, that's why we are still here. The basic building blocks are all there, cryptography for privacy and identity. p2p networks for data transfer have worked in the piracy world for many years too.
What is missing is putting it all together and be able to replicate the network effects you get from centralized media, like if you are able to reach one person, be able to reach in a simple way all of his friends as well (supposing they want to be reached).
What is missing is putting it all together and be able to replicate the network effects you get from centralized media, like if you are able to reach one person, be able to reach in a simple way all of his friends as well (supposing they want to be reached).