A social networking system, computer program product, and methods with a Personal Avatar executing on a first server node and a zero knowledge Arbiter executing on a second server node in a network of the social networking system. The Personal Avatar communicates social networking system messages in a communication session using a zero knowledge protocol with the zero knowledge Arbiter executing on the second server node operating in zero knowledge and using zero knowledge verifiable computing to enforce usage conditions on social networking system messages communicated in a communication session with the zero knowledge Arbiter. The zero knowledge Personal Avatar communicates social networking system messages in a communication session using a zero knowledge protocol with the zero knowledge Arbiter. The methods ensure privacy of an end user of the social networking system.