I joined this furry social networking site a week ago and I'm quite enjoying it so far. It looks -very- much like FB at the moment in layout and UI but it will gradually be given it's own identity instead of being a clone (and the guy running it has covered his butt legally here, so it's not a problem). It's only about a month old and exploded in popularity very quickly, necessitating some down time for a server upgrade which was completed recently. The site is still very much in beta, so there's bugs to be squashed and improvements to be made but the guy running it seems pretty determined to turn it into a decent alternative to FB especially geared towards furs. I happily accept friend requests so feel free to toss me one if you decide to join.

http://www.furgather.com/EoFenstalker