First of all it was third party network issues then again. Apparently they had to quite literally turn off the site and then turn it on again!! WoW
Here is a link to exactly what occured. http://www.facebook.com/notes/facebook-engineering/more-details-on-todays-outage/431441338919
I guess it's all depend which country you are from.. here it crashed for a several hours.. many people were panic lol