Risk analysis of online social networks

Social networks are used as the communication network among the groups of people. In past few years several fields use the structure of social network and utilize it. But there are many threats and challenges associated with these networks. These threats disclose the personal information of the users and use that information for unauthorized and malicious purposes. One of the great revolutions in the field of online social networking is online health social network, which is a sub branch of ordinary social network. OHSNs are used for enhancement in the field of health care issues and improvise the better solution for those issues. In this paper we discuss security issues and privacy risk which harm the online social network user. In addition we survey the existing defense mechanism and also propose the better protection and security ideas for online social network users. Furthermore we advise future research directions.