A social data management system and a method for operating the same capable of managing social data with respect to various social networking services based on a mobile platform through a social data management system in a mobile device are provided. A system for supporting a social networking service includes a plug-in manager for managing social data of the social networking service used by a user through a plug-in library structure; and a common characteristic processor for tracking an activity of the user based on use of an SNS of the user to extract a user interest keyword, extracting another user whose interest is similar and social contents, and automatically selecting social content preferred by the user, and giving a priority to the selected social contents.