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Facebook | Login

First time I've seen Facebook errors: -

"Hey, your account is temporarily unavailable due to site maintenance. It should be available again within a few hours. We apologize for the inconvenience."

My photo albums disappeared and the homepage after login wasn't displaying the right info.

Looks like Facebook broke something badly, maybe they had to do an upgrade and it didn't work? Well it could be anything but coping with the growing number of users must be extremely difficult.