I can't answer your question completely and I'm by no means a legal expert, but I know that German law states that you have to abide by German laws if you website is targeting visitors/customers living in Germany, even if you aren't German yourself.
Short example: An American hosting a personal WW2 website in the US with a huge German user-base has a good chance of getting in trouble in Germany if he denies the existence of the holocaust on it.
It took quite a while to dig up some facts about this topic, but take a look at http://juris.bundesgerichtshof.de/cgi-bin/rechtsprechung/doc... (in German, but can be translated with Google translate). According to that article our BGH thinks that the New York Times has to take down defamatory statements about a German/Spanish resident that went to court in Germany if they don't want to break German law. Further down they even add the fact that the NYT had ~15,000 registered German users back then to solidify the claim that the NYT is targeted at a German audience. IMO this shows that some connection to German residents has to exist for German law to be concerned. From what I know, a German telephone number or offering a German translation of a website might suffice for this connection to be made, too.
On another note: I have not found any case where an extradition to Germany took place, but I have heard of non-internet-cases where people got into trouble when they traveled to Germany.
Short example: An American hosting a personal WW2 website in the US with a huge German user-base has a good chance of getting in trouble in Germany if he denies the existence of the holocaust on it.
It took quite a while to dig up some facts about this topic, but take a look at http://juris.bundesgerichtshof.de/cgi-bin/rechtsprechung/doc... (in German, but can be translated with Google translate). According to that article our BGH thinks that the New York Times has to take down defamatory statements about a German/Spanish resident that went to court in Germany if they don't want to break German law. Further down they even add the fact that the NYT had ~15,000 registered German users back then to solidify the claim that the NYT is targeted at a German audience. IMO this shows that some connection to German residents has to exist for German law to be concerned. From what I know, a German telephone number or offering a German translation of a website might suffice for this connection to be made, too.
On another note: I have not found any case where an extradition to Germany took place, but I have heard of non-internet-cases where people got into trouble when they traveled to Germany.