Do you mean "how much a 'regional' crisis affects an internet business based in the US"? I'm pretty sure that if this leads to a break up or two-tier Eurozone,

Do you mean "how much a 'regional' crisis affects an internet business based in the US"? I'm pretty sure that if this leads to a break up or two-tier Eurozone, then it is going to touch every business, every where, because economies are like kids at school -- once one gets sick it passes it on to all the others. It's certainly going to affect everyone in Europe, even those that aren't in the €. It's going to affect exchange rates. It's going to affect the ability of many people to buy your goods. And so on...