There is a growing number of opportunities for users to share media using Web content providers. Moreover, in the context of Web-based Social Networks, there is also the possibility that shared media will be used in subsequent social interactions. Considering the importance of understanding the underlying collaborations, we have been investigating a human-readable technique for representing media-based social interactions. In this paper we propose a procedure for analyzing interactions among users in Social Networks, and analyze social interactions based on video and link sharing from Web providers to a Social Network. The results can be used by social application developers, e.g. in the evaluation of the user interfaces they design, or by social scientists interested in analyzing the social interactions.