I don't know about Facebook, but I have had other accounts send me similar emails. This usually happens when I logged in to the account from a new computer or from a friends computer.

It's a safeguard.

If you got this message as an e-mail and it contains a "handy" link you're supposed to click to take you to your Facebook login page, don't click it. Go to Facebook directly. Pretty much every time I get a message like this, it's completely false and nothing is wrong with my login/account. It's usually just somebody trying to steal your login information.

People tend to log into FB from all sorts of various devices. I have an iPhone, iPad, desktop Mac and work computer. This is merely a message when you log in that FB doesn't recognize the device you used to log in. It asked you only to supply a name -- any name, it could be Fred -- which you will recognize in a confirmation email to the addy you gave FB when you opened your account.

You aren't asked to click on anything. FB simply sends an email, just as it says it would, saying basically "Someone just logged into your account using a device named Fred." The email provides time and date of login, including the ip address used at the time. Yes, there is a link to contact FB it wasn't you, but you can (and should) still follow the usual c&p procedure for following email links.

IOW, the email directly relates to specific a activity at a specific time and place which only FB would know and only you can verify. It would be pretty damned tough for an email scammer to pull that one off!

If you clear the cookies and/or cache on a machine you regularly use, you'll get that message.

It's not an email. If it is an email, 99% sure it's a scam.

Your password may be too hackable. Are you using non-repetitive numbers with letters.

Good luck.

Like if I log in from a friend's computer. It's a Facebook safeguard.

don't do it.

http://www.snopes.com/computer/facebook/violation.asp

but yeah, what they said upthread

The message was legit - someone took over my account. You better check your shit.

eta: They were messaging my friends telling them I was stranded in London - send money. Change all your passwords, including email.

I've always said that all the "free" crap on the Internet is just a way for them to slip the ring through your nose, that cartoon tells the story even better than my wordy explanations.

If it used your name it's probably legit. If it started out "Dear Valued customer" or some such variation, it most likely isn't.
Even if legit, I wouldn't use the link in the email but go directly to the website.

Turns out someone on and iPad from Bangkok tried to sign into my Facebook..we also recently got our debit card stolen from some online business on which we used it? And one charge was in Bangkok..One from the UK and two from Zayles Jewlers?

They had me change my password..and this time I made sure it was 'strong'.