“…SNSs likewise connect individuals in various arenas, such as romance (e.g., Friendster.com), business (e.g., LinkedIn.com), and shared interests (e.g., MySpace.com). The blossoming of SNSs has also triggered academic research in different fields, such as identity construction and expression (Boyd and Heer, 2006), friendship racial homogeneity (Mayer and Puller, 2008;Wimmer and Lewis, 2010), social capital building and maintenance , social grooming (Tufekci, 2008), information disclosure (Gross and Acquisti, 2005), personal profile characteristics , privacy concerns (Gross and Acquisti, 2005;Hodge, 2006;Lewis et al, 2008), user and non-user differences (Hargittai, 2007), and so on. In particular, friendship ties in SNSs, such as Facebook, are especially ideal for testing our two preference dimensions -in-group identity and higher status -on friendship choice.…”