Amnesia: The Dark Descent
If you like games made by Frictional Games like Penumbra Overture, Penumbra Black Plague or Penumbra Requiem then you should become a member. This group is unofficial but I will try to inform you about everything related to FG.
http://penumbra.herniweb.cz/ (Slovak language)
(If you know more fansites please post link in comments)