Facebook login with yourFB Address

Some time ago Facebook
released a feature to personalize
your Facebook address as the
user desires such http://
www.facebook.com/yourname.
This time, Facebook added back
a feature where you can log in
by using your address them.
Where previously to login using
your email address.
Examples like this, your
Facebook address is http://
www.facebook.com/mr.o2n. You
can log in to Facebook can be
your address is:
mr.o2n and
password as your password.
fblogin
So you can login using email or
using your Facebook url address.