One of them.

I think it's the offical one?

I don't know that much about HF on facebook. Maybe Jelena does?

That official page is probably administered by her.

The official Hammerfall facebook page:
http://www.facebook.com/hammerfall

Hammerfall Fan Club facebook page (Unofficial)
http://www.facebook.com/HammerFall.FanClub

Jelena is the admistress of the fan club!

..And wait for the website of the fan club!!

Jelena knows but Jelena has been quite inactive here lately.

"Fanpage" meaning like their official site? But where did you run into the link for the forum over there? I've never seen it...

...or "fanpage" as fan club? In that case it's not "official" (yet) and it's the only one, my page, just like omonoia 1948 said.

Yes, wait for the page and for the forum for fan club!