@conference {zheleva:www09, title = {To Join or not to Join: The Illusion of Privacy in Social Networks with Mixed Public and Private User Profiles}, booktitle = {18th International World Wide Web conference (WWW)}, year = {2009}, note = {Earlier version appears as CS-TR-4926.}, month = {April}, keywords = {anonymity online, groups, privacy, sensitive attribute inference, social networks}, author = {Zheleva, Elena and Lise Getoor} }