In the U.S. at least, I could see reasonable legal action on the part of the original owner, as she seems to have a common law trademark that would supersede an

In the U.S. at least, I could see reasonable legal action on the part of the original owner, as she seems to have a common law trademark that would supersede any legal trademark. Maybe Twitter would accept that argument, or maybe you'd have to go to the USPTO and contest the filing (costing more money). Filing is expensive ($3-400), but it's a thought considering how many of us have online identities that are legally unprotected.