In this paper, we propose a collaborative learning service in ubiquitous environment for social networking service (SNS). The main characteristic of the service is that the users use the service to search the person who can solve the problem, and an appropriate request chain of friends (CF) will be recommended, upon their request. It allows the members to interact and expand the network of friendship. It provides the Knowledge Awareness (KA) to enhance and collaborative learning and support the sharing and creation of the knowledge.