T11 All about library things

http://www.librarything.com/zeitgeist
50 largest libraries (see more)
CovenantNetwork (14,980 books), kittylafong (13,030 books), AsYouKnow_Bob (12,023 books), bookstopshere (11,174 books), pagerd (11,115 books), antimuzak (10,960 books), libvicki (10,753 books), ginaruiz (10,552 books), JeanLittleLibrary (10,312 books), devenish (10,234 books), Patentnonsense (10,090 books), eromsted (9,945 books), shearrob (9,723 books), carminowe (9,629 books), tehipite (9,616 books), mitchellray (9,457 books), gaspari (9,328 books, private), kauders (8,830 books), jalual (8,762 books), ellenandjim (8,567 books), shauneeh (8,456 books), hailelib (8,348 books), ariadne02 (8,290 books), bertilak (8,108 books), rpglibrary (8,105 books), dean (8,040 books), debweiss (8,025 books), donandpatti (7,602 books), kendralou (7,567 books), oakesspalding (7,517 books), popa (7,473 books), LauraLLD (7,465 books), meadcl (7,367 books, private), nykolaibasket (7,249 books), lycanthropist (7,235 books), dbstgb (7,206 books), xenchu (7,066 books), MMcM (7,044 books), Rynosseros (6,998 books), Britbully (6,820 books, private), Fogies (6,800 books), slothman (6,748 books), EAllynM (6,732 books, private), eugprorok (6,715 books), HeatherC (6,699 books, private), GreyHead (6,693 books), trollsdotter (6,657 books), Savages (6,628 books), prufrock9 (6,606 books), TomVeal (6,589 books)

Authors who LibraryThing (complete list)
Naomi Novik, Susan Wittig Albert, Sharon Lee, Janny Wurts, John Green, Elizabeth Bear, Sara Donati, Martha Wells, Susie Bright, Joe Hill, C.E. Murphy, Sandra Gulland, Sarah Monette, Carl Zimmer, Jonathon Green, Robin D. Owens, Brandon Sanderson, Christopher Locke, Sherryl Woods, Brent Hartinger, Melissa Wiley, Greg Stolze, Shanna Swendson, Sylvia Louise Engdahl, E.E. Knight, Lisa Carey, Ann Douglas, Paul Sloane, Richard E. Dansky, Danilo Kis

25 top languages (translations from)
French (332,930), German (251,456), Japanese (180,162), Spanish (107,411), Russian (97,635), Italian (91,589), Greek (Ancient) (82,733), Latin (59,667), Dutch (34,561), Swedish (30,253), Chinese (25,292), Portuguese (22,812), Multiple languages (21,724), Norwegian (21,082), Hebrew (17,331), Danish (15,765), Czech (15,445), English (Middle) (12,649), Polish (12,610), Arabic (9,229), Old English (6,554), Sanskrit (6,090), Turkish (4,984), Finnish (4,687), Persian (4,529)