Reddit? No, I don't know either. It's big and diverse and has message boards for everything under the sun. Including one (or maybe lots) for fantasy books - namely r/fantasy. That tiny (well ... ok, it has 25,000+ readers, so it's pretty damn big really) corner of reddit I know about. It's a very active forum on all things fantasy filled with robust opinion. They run regular Ask Me Anything sessions with authors and in the past year have had best selling writers such as Pat Rothfuss, Joe Abercrombie, Jim Butcher, Peter V Brett, Scott Lynch, Lev Grossman, Robin Hobb and the like on to answer members' questions in real-time. This can be a real laugh-riot.
(could't afford Pat Rothfuss' appearance fee so here's his beard's stunt double)
Anyhoo - long story short. Go sign up. It's a fun place to hang out if you're a fantasy geek.
Additionally... they ran 'Best of 2012' polls for best fantasy novel and best fantasy debut. These are the official results as collected by Reddit Fantasy's elquesogrande at the appointed time.
#1 Brent Weeks - THE BLINDING KNIFE
#2 Jim Butcher - COLD DAYS
#3 Mark Lawrence - KING OF THORNS
#4 Joe Abercrombie - RED COUNTRY
#5 Anthony Ryan - BLOOD SONG
Other nominees included:
Chuck Wending - BLACKBIRDS
Steven Erickson - FORGE OF DARKNESS
Robert Jackson Bennett - THE TROUPE
Travis Luedke - THE NIGHTLIFE NEW YORK
Richard K Morgan - THE COLD COMMANDS
N.K. Jemisin - THE KILLING MOON
#1 Saladin Ahmed - THRONE OF THE CRESCENT MOON
#2 Anthony Ryan - BLOOD SONG
#3 Myke Cole - CONTROL POINT
#4 Michael R. Underwood - GEEKOMANCY
#5 Jeff Salyards - SCOURGE OF THE BETRAYER