is there any security system on facebook like two step verification on gmail?

[Sanjay]

Facebook security

[Pulsar]

Yes there is.

you can choose to be sent a security code to
your mobile phone,
after signing in, a code is sent,
the code has to be entered before you
can proceed to your account.


.

[Mr Rochey]

There is something called "Code Generator", more info here: https://www.facebook.com/help/270942386330392

But check Facebook's security page for more information
https://www.facebook.com/about/security

Hope this helps.
~Mr Rochey~