Facebook lunched one-time password for non-secure computers in places like hotels, cafes or airports. The one-time password (OTP) will be sent to you as a text message If you have any concerns about security of the computer you’re using while accessing Facebook. Facebook can text you a one-time password to use instead of your regular password.
Simply text “otp” to 32665 on your mobile phone (U.S. only), and you’ll immediately receive a password that can be used only once and expires in 20 minutes. In order to access this feature, you’ll need a mobile phone number in your account. Facebook are rolling this out gradually, and it should be available to everyone in the coming weeks.