Facebook: Account temporarily unavailable

I come back home from work and check out my official and personal emails, Twitter, Facebook, Google+, Yammer, and Google Reader feeds, not necessarily in that order, and find that my Facebook account is temporarily unavailable. Facebook wants me to "try again in a few minutes".

I keep coming back again during/after I check the other feeds, but cannot access my account yet. There is no way I can even log out other than killing my browser which I don't want to. I login through another browser and Facebook now tells me my account should be available in a few hours!

I must admit that this is the first time in the life of my Facebook account, which is around three years old, that I cannot access it. But this coming at a time when Facebook users are anyway getting tempted towards its Google counterpart?