Since Feburary 2013, IEEE Special Technical Community on Social Network (STCSN) has launched its E-letter on social network related projects and researches every three months on the website (http://stcsn.ieee.net/e-letter). The aim of the STCSN E-Letter is to provide timely updates on recent developments, hot research topics, and society news in the area of social networking. Each edition publishes a set of research articles that discuss topics in the realm of the community. For detailed information, please refer to http://stcsn.ieee.net/e-letter.