IIRC the US requires that you prove the libeller knew it was false as well. Basically if you act on good faith you are clear, even it isn't true. (Note that th

IIRC the US requires that you prove the libeller knew it was false as well. Basically if you act on good faith you are clear, even it isn't true. (Note that there are requirements that you took some measures to verify the legitimacy depending on your position).