“…Karr-Wisniewski et al [18] identified five types of boundaries that people regulate with different mechanisms, in order to achieve the desired privacy level in SNSs: network, territorial, disclosure, relationship and interactional boundaries 2 . For example, turning off the wall on Facebook is about controlling the interactional boundary, whereas removing someone's distracting comment from the personal wall is about controlling the territorial boundary [18,19]. In practice, these mechanisms need controlling actions by users such as filtering, ignoring, and blocking connections, withdrawal from sharing content, aggression, compliance and compromise [4].…”