Wikipedia
OpenAutonomy is a protocol facilitating decentralized social networking and other web services. The design of the system allows users to interoperate across different internet servers and domains with no central mediating authority. Further, each user can also possess application instances running on different internet servers and domains yet still interacting with each other across these boundaries.
The intent of the technology and its users is to build a distributed, federated, extensible web platform to compete with the current " walled garden" approach. The idea is to break the boundaries between services/servers and web/ native and allowing everything to inter-operate with an emphasis on: extensibility, innovation, privacy, and freedom.