There's fandom and then there's FANDOM. Some may devote a Facebook page to a personal interest of theirs, or maybe even create a dedicated website, but you've probably never seen the like of what Tolkien scholar Mark Fisher has created concerning the works of J.R.R. Tolkien - The Encyclopedia of Arda.
This site is comprehensive in its coverage of Tolkien's fantasy world of Middle-Earth; no topic is too obscure and no detail is too small. It is an immense reference and repository of knowledge that should interest any devotee of Tolkien's works and I find myself referring to it on a regular basis. Go on, name anything concerning Middle-Earth and see if it cannot be found therein - I dare you.
Check out The Encyclopedia of Arda.