The trouble is that most conventional ways of building a new service are trivial to block. What is needed now is unstoppable messaging and social networking built on top of existing services and protocols that won't be blocked right away, services with more legal protection - like email with GPG, or some kind of steganographically encrypted layer on top of Instagram.
Imagine all I ever posted was cat pics... unless I have your public key and then all of a sudden those pics are decoded into messages of dissent