Twitter user handles are - if it's not already taken - go ahead and use it. Validation (if I remember correctly) is a basic "we're sending you a link to verify that this is the email attached to the twitter handle" -- or maybe there's two-factor authentication.....but my dog could have a twitter handle...as long as it connects to a live email account. And believe it or not -- some people have multiple email accounts - twitter handles - even FB profiles.
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