The purpose of this study is to explore how social networks impact learners' knowledge sharing in the context of a learning community. The findings indicate that the various networks collaboratively support learners' knowledge sharing in a local community. A better social position gives rise to more networks and correspondingly more knowledge accessible to learners. The between-group ties such as residential committees are crucial for knowledge exchange through connecting various social networks. Social isolation impacts learners' interactions with others. However, more networks do not necessarily lead to more advanced knowledge acquisition. Accessing social networks cannot guarantee that learners will successfully access substantial knowledge in other fields. Social networks targeting learners' need influence learners' interest in social networks.