Facebook will be back soon error

This message was showing when i came back to the facebook. This message was showing approximately two times till i'm writing this article. Did you get one same ?, what do you think about this ?.

After i got this message, i shocked. I thought my account was stoled by some one. But after i read some text in red box attention. I got text 'We are still maintenance, your account will be back soon. No any change, you're still can login with your password and email.

And i'm searching about this problem in Facebook Help, i got "

If you're seeing this message when you log in, it usually means that we're making an improvement to the database that your account is stored on. While we're doing this, you won't be able to access your account. We're sorry for the inconvenience! This maintenance shouldn't last more than a few hours.

A few notes:

• After the maintenance is over, you'll still be able to log in with the same password
• Your account will not be affected by the maintenance
• We don't do site maintenance on all accounts at the same time, so it's possible that your friends will be able to access the site while your account is unavailable "

Oke, and if this message showing up more than 24 hours, you can contact facebook at :

hxxps://www.facebook.com/help/contact.php?show_form=site_maintenance

Referrence :
www.facebook.com