This paper presents MobiSNA – a mobile video social networking application that supports the exploration, sharing, and creation of video contents through social networks. The MobiSNA project provides the user with an easy to use experience of accessing video content from mobile devices (e.g., mobile phones, PDAs) over wireless broadband networks (e.g., 4G networks). This demo focuses on the key functions of MobiSNA which support social network-based video exploration, real-time video sharing, video blogging, video interest groups, and video story construction. A system architecture of MobiSNA is also proposed. Categories and Subject Descriptors H.5.1 [Information Interfaces and Presentation]: Multimedia Information Systems – video. General Terms Design, Human Factors, Social Networks, Mobile Devices Keywords Video social networks, mobile social networks, mobile video sharing, social networks