My Kanjani8 fandom mainly uses a forum...I'm kinda bad about keeping up with it though.....although that isn't all that different with how I am at posting here ^^;

I got into that forum by meeting some of the people in person and I was already in the fandom, though not active online....so it doesn't fit the other questions.

No real difference in the people here and the people there (some of them are here too) but I'm more active on lj (for various qualities of active). I think it's just easier to check because of the list format.