Distributed knowledge has attracted more and more attention as a way to improve knowledge sharing across the world using the Internet. This paradigm enables many systems to interact with each other and share their knowledge while keeping their own ontology. Several researchers have worked on this topic with different strategies but they all argue that the main issue is to make sure that the other systems understand the concepts of its domain correctly. In order to be sure that they understand each other, systems use concept learning to learn the meaning of concepts they communicate with. In this paper, we try to overcome this complexity by suggesting a system that enables agents to learn new concepts from several different agents at the same time and each agent has its own ontology. We use social networks paradigm to communicate between agents to enhance the accuracy of learning process.