A website may be complex enough and distributed enough to straddle multiple jurisdictions (this isn't an entirely new situation though since similar issues came up with radio spectrum regulations).

The bottom line is this: your jurisdiction extends as far as your control. A court may be able to issue injunctions against the systems which are located on its jurisdiction which may only be a subset of systems supporting a given site. In places where it is legal, it may also censor the internet. If everything from hosting, through advertising, payments and readership are outside the jurisdiction then it can do nothing directly and must resort to seeking assistance from foreign jurisdictions. I'd say in those situations it is entirely appropriate.