“…This is because excessive identification with a specific group would be expected to narrow the person's network as a whole, a boundary effect that results in diminished potential benefits, even though such identification does serve to maintain relatively powerful connections with group members (Gaertner et al, 2006;Tajfel & Turner, 1979;Turner, Hogg, Oakes, Reicher, & Wetherell, 1987). The boundary effect is in line with the finding that group identification leads individuals to perceive other group members as a source of social support (Haslam, Jetten, O'Brien, & Jacobs, 2004;Haslam, O'Brien, Jetten, Vormedal, & Penna, 2005;Underwood, 2000).…”