I. Introduction
Online social networks (OSNs), for example Facebook, allow users to build an online presence thereafter a virtual community in which users can interact, share and post about their personal information. OSNs have already woven into the fabric of our online lifestyle, and this trend is expected to grow in popularity in years ahead. At the same time there also exists a growing concern about fake users who can easily deceive themselves off as somebody else, by using photos and profiles either snatched from a real person (without him/her knowing) or generated artificially. In this paper, these fake accounts are generally called imposters who claim to be somebody that they are not. Usually identities of real existent people are being used; profile information like photos, address and affiliation can easily be obtained online from websites and search engines.