Realistically, moderating this group wouldn't entail much. It's not the moderator's job to increase membership. It's to make sure that the
threads are kept civil and (loosely) on topic, and adhere to forum rules.
I haven't seen any problems in here yet that would call for active moderation. Probably the biggest thing I'd keep an eye out for are insensitive/moronic posters who would come in and make light of various maladies suffered by those who frequent this social group.
If it's a moderated/private group, it would also entail approving membership.