I came across some doubts while creating facebook groups. From what I read it's best to wait the groups to have several members to start monetizing them. But the question is will the previous members see the posts in the group? In my case with my personal account I've joined quite a lot of groups and never checked them again lol . And I rarely see in the news feeds about the groups except for 'someone and 12 more of your friends have joined this group' but do the wall posts or the discussion threads go to the feed?