This is the longest outage I can remember (around 12 hours). I can imagine there are many people who are lost right now...or angry they can't play Farmville or Mafia Wars...or can't communicate with friends because it seems like no one keeps track of people's email addresses anymore.
This does seem to be an issue with certain people's accounts. My professor one works fine, but most of my friends can't get in, and I can't get in to my personal account.
I am sure heads will roll at Facebook after such a long outage.