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The blooming development of internet technologies, lead to the growth of Online Social Networks (OSNs) day by day. There are many Online Social Networks (OSNs) came on internet but still very few could get the attraction of the users forever. The most attracted and world level leading Online Social Networks (OSNs) is Facebook, Twitter, and Google Plus and so on. All these Online Social Networks (OSNs) allow its users to create profiles and share any information on their profile, which could be viewed by other users of the same network user. These Social Networks allow users to form friendship with other people and make them to get connected in an easiest way. The major advantages of these Online Social Networks (OSNs) are getting connected with friends (wherever they are in the world), thoughts and ideas can be shared on online and feedback could be obtained as soon as possible. Every user of Social Networking sites will have many more confidential and private data on their account. However the Security and Quality of Service (QoS) are the major constraints must be always maintained in all the social networks. Most of the Online Social Networks (OSNs) provides security to the data available on the user account and provides good Quality of Service (Qos). Obviously the security constraint must be maintained not only the data available on user account but also must be maintained to the user account completely, which ultimately improves the efficiency of Quality of Service (Qos). In this paper, we evaluate and propose a new model to enhance the security for improving quality of service in online social networks.

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