It is basically possible to track people but it is very difficult and involves more than sitting on a computer and "scanning the world". Nobody will start such a complicated chase unless the person is a national danger.
Better do not answer any of his posts or mails and tell your users to do the same. And delete his accounts over and over without saying a word. On the long term you will win, these people live on communication. If you don't talk but just throw his accounts away, he will get tired rather quickly. Don't talk.
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