“…Traditional social groups and communities provide many benefits for their members, including opportunities for affiliation or companionship (McClelland 1985, Roberts 1998, Rubenstein and Shaver 1980; opportunities to influence people (Winter 1973); social support (Wellman andWhortley 1989, 1990;Wellman 1990); access to information; the ability to disseminate ideas rapidly (Kaufer and Carley 1993); and support for collective action (Ostrom 1990). Likewise, online social structures provide a variety of benefits by supporting the development of interpersonal relationships, feelings of companionship, and perceptions of affiliation (Furlong 1995, Hiltz 1985, Meyer 1989, Rheingold 1993, Walther 1994; encouraging discussion and knowledge sharing (Abbot 1988, Kraut and Attewell 1993, Wellman 1995; allowing individuals to access information and quickly disseminate their ideas (Constant et al 1996, Finholt and Sproull 1990, Whittaker 1996; providing social and emotional support (King 1994, McCormick and McCormick 1992, Rice and Love 1987, Walther 1996; and enabling collective activities such as software development and political action (Ogan 1993). Whether traditional or computer-mediated, social structures provide a variety of benefits for individual members, enabling them to attract and retain members.…”