- last post: 01.01.0001 12:00 AM PDT
The Seventh Column refers to the community as a whole. But, it is more often than not used to refer to the Bungie.net fanclub network (details here), essentially a collection of member-run mini-websites (Chapters/Groups) in which you are free to participate (provided you meet the Chapter-specific criteria, ie. there's no point in trying to join a moderator-only Group).
[Edited on 10/12/2005]