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@chris Best move is to delete all content, squat on the username.

If you have a website, note in your contact that you are not on Twitter or only username squatting so its not ambiguous.

Perhaps there could be more done, like hijacking the page with a referrer, if attributed to Twitter, with a modal or a warning saying that you don't have a twitter account and if any account is using your name, they're trying to scam you.