Online social networking has become a popular activity in recent years. Participants are willing to share various content not only to private groups but also to public communities. Meanwhile, the increasing smart mobile device users bring the online social networking to mobile terminals. Mobile users’ roles have been switched from content consumers to content providers. Various mobile devices generated content such as video records, pictures, and local events were shared to online communities. However, in the current stage, content sharing is still relying on centralized control or tightly-coupled technologies.