Sense of Community: Is there a fifth dimensions?

In three papers, Obst et al. [1, 2, 3] published the results of their investigation about the sense of community (SOC). They had asked 359 members of SF fandom attending Aussiecon 3, the 1999 World Science Fiction Convention about the way they feel about the fandom community (a - relational - community of interest with membership from all over the world) and about their neighbourhood (a geographical community). The main research interest was to find out whether McMillan and Chavis' four dimensions of SOC played a role in both community types (relational and geographic) and whether there is a separate fifth factor - conscious ingroup identification. Both assumptions were confirmed by the results.