Conclusions
Despite the growing body of research addressing OSN privacy issues, currently, data as one of the fundamental building blocks of OSN is not well understood. The lack of a generally accepted terminology and classification for existing data elements as well as the small number of publications considering implications of differing semantics of data types for social identity management further substantiates the argument. Yet, data is at the core of any discussion of privacy issues on OSNs. Without a precise terminology and classification of all types of data on OSNs, it is difficult to unambiguously specify privacy-related problems which ultimately impedes the development of appropriate solutions.