Mobile Online Social Networks (mOSNs) have recently grown in popularity. With the ubiquitous use of mo- bile devices and a rapid shift of technology and access to OSNs, it is important to examine the impact of mobile OSNs from a privacy standpoint. We present a taxonomy of ways to study privacy leakage and report on the cur- rent status of known leakages. We find that all mOSNs in our study ex…