“…With the access control mechanism, users may specify that certain of their profile items are accessible only by 'friends', 'friends of friends', or certain members in the friend list by using an access control list (Lugano and Saariluoma, 2007), multilevel access control list (Park et al, 2010), degree of relationship (Cai et al, 2009), or hidden friendship matching (Preibusch and Beresford, 2009). The users may iteratively capture their privacy preferences by using 'Privacy Wizard' (Fang and LeFevre, 2010) or may use an automated service such as 'Privacy Butler' (Wishart et al, 2010).…”