JCOM_V2_N3_RP4 Radha Krishna K. Chandra Sekharaiah Journal on Computer Science 2347–6141 2 3 17 24 Social Network, Multiparty Access Control, Security Model, Policy Specification and Management In recent years, Online Social Network (OSN's) have a great growth and a fabulous usage for thousands of millions of users on the Internet. These OSNs have become a main forum for digital social interactions and sharing of Information among users, but they does not have a proper facility of providing security and privacy apprehensions. Users manage these OSN’s access to share data, and presently there is no method to provide proper privacy concerns over the usage of data by multiple users. In this paper, the authors have suggested an approach in how to allow and protect the shared data of multiple users associated in OSN’s. The authors have designed a method to declaim these sense of multiple use conditions, including a method of policy specification of multiple users, and how to use this method of security of user's data. In this paper, the authors have included a logical representation of users access control model, which allows many users to work or extend this model. Proof of concept of approach of safety for an application on face book has been discussed and usability study and evaluation of the method, has been provided. September - November 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3313