In a widely reported court case, Facebook won an $800M default judgment and injunction against a Montreal man named Adam Guerbuez, who has a long and sordid history. But it probably won't make any difference.
The problem is that he's in Canada. The $800M is for violations of the CAN SPAM act, but Canada doesn't have any laws comparable to CAN SPAM. (Indeed, they have no laws against spam at all, other than the weakly enforced PIPEDA privacy law.) This means that should Facebook try to enforce the injunction in Quebec, he'd have a reasonable shot arguing that what he did wasn't against Canadian law, hence it's not collectible.
Facebook's original complaint also invoked Federal and state computer tampering laws, but the judgment doesn't refer to them. The judgment also enjoins Guerbuez from ever using Facebook again, so if he does, Facebook can go back to court, get him cited for contempt, and try to enforce that in Canada. They'd have a better chance doing that, but who knows how long it will take.
As has become increasingly apparent, the key to legal success against spammers is close international cooperation, since the various pieces of illegal spamming operations, botnet infections, botnet spamming, order collection, and making and delivering goods are often spread all over the world. You'd expect Canada and the US to work well together here, but for some reason, the coordination so far has been less than impressive.
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