Honestly, I frequent the FF Community a lot, but it's just dead. The common criticism about FF fans being fickle and liking the games very different from someone else is probably true and thus there isn't much common ground to discuss a lot of things.
Not to mention that people who post there are more invested in the individual games than the franchise ongoings at large. I instead post on the Persona board, and everyone (including me) knows what's happening with the franchise with not just the mainline games, but the spinoff games, concerts, and anime/movie adaptations as well. It's also much easier for a newcomer to jump in since it's the new hotness.
The MGS Community thread is healthy as well because people like all of the games and have common ground there. FF is just a different beast with too many interests spread out.