I've got two Sailor Moon forums. The first one I made 2008 and the other one I made this year 2014. The first one has 20 members and the new one only has 3 member so far. The first one is called Sailor Moon Realm and the second one is called Pretty Guardian Sailor Moon Crystal. There's a lot of members on the first forum that aren't active anymore.
Sailor Moon Realm Link:
http://sailormoonrealm.proboards.com/
Pretty Guardian Sailor Moon Crystal Link:
http://sailormooncrystal.proboards.com/
These forums are open for anyone on here to join because the more members the better.