My goodness! I thought this community had fizzled out or something because nothing ever appeared on my friends page; now that I happen to be reviewing my communities one-by-one, I see why. This info is buried in LJ's FAQ: journals/communities that have a post with a future date at the beginning are blocked from appearing on friends pages. I learned this when my own friends complained that a booklist I create never showed up for them ... once I moved the top-post info to the list's profile, all immediately became visible.
Just letting you know because I bet I"m not the only one ... you'll likely get reviews flooding in if you make the "visibility" change. (and now that I'm aware, I have incentive to get to work on my own contribution) ;-)