Re: You're damned either way @solidsquid
...offence in the US or targeting the US...
What happens when somebody tweets something subsequently viewed in the US? Would this count as being published in the US since it has been made available there? What would then constitute 'targeting' I wonder if it's subsequently found to be libelous?
...controlled by various international treaties...
You mean like the MLATs ignored by the US in the Microsoft case? What makes you think they wouldn't be willing to ignore other international obligations when they get too 'cumbersome'?