I've joined,
I think it would be useful (and the AHS twitter) to announce of important news and info being posted in the forum, release announcements, blog entries, lyrics, mag shoots etc. If anything pretty big is posted in the forum you could announce it via FB and twitter. Then I'd find it useful.
If it's just gonna be general info about ayu and a few random discussions I'm not sure how useful it'll be.
Try to emphasise the international side of things, particularly translations and scanslations etc.
then you might find a niche, cos there are some decent ayu pages already on FB, which post info and stuff. But one which was catering to english speakers would be something new I think...
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