On-line social networking has become a very popular Web 2.0 application. This paper studies the issues around using web mining techniques for analysis of on-line social networks. Techniques and concepts of web mining and social networks analysis will be introduced and reviewed along with a discussion about how to use web mining techniques for on-line social networks analysis. In addition this paper sets out a process to use web mining for on-line social networks analysis, which can be treated as a general process in this research area. Discussions of the challenges and future research are also included.