The Interstate Commerce Claus doesn't pertain to jurisdiction, but to authority. On paper, the federal government only has the powers that we have expressly enu

The Interstate Commerce Claus doesn't pertain to jurisdiction, but to authority. On paper, the federal government only has the powers that we have expressly enumerated to it in the Constitution. One of those powers is to regulate commerce among the several states. Originally, this was so that a person in one state would have a venue to sue a company in another state that it did business with and have a fair judiciary, but has since expanded to encompass regulatory authority. It is due to the Interstate Commerce Clause that the government might pass a law, not that it entitles them to sole jurisdiction over a company breaking a state law. Put simply, if there's a law against killing puppies in Georgia, but there's no law against killing puppies at the federal level, that doesn't mean that Facebook can kill puppies in Georgia and get away with it. If there is also a federal law against killing puppies, and Facebook kills puppies in Georgia, then either Georgia or the federal government can file charges, and jurisdiction would be settled then. In this case, because it was an Illinois law, only people who have used Facebook in Illinois may be plaintiffs.