Steam Group

Perhaps this is the wrong place to put this, but seeing as how there really isn't a specific pc or steam forum that I saw I thought I would post here. How do we get an invite into the steam 2o2p group?  I'm a fairly newish user to steam and haven't really begun to learn its features as of yet, but looking up the group just told me it was invite only and I didn't see anywhere to request said invite.