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Not do it again.. There is nothing I know of they can do..Once its sent, then its gone for good.

But they can change their key, can't they? So it is no longer able to be abused.

Should they create a new steemit account at this point to avoid anyone missing their account?

No, actually I was wrong.. like @bex-dk mentioned, they can change their passwords and keys and should so immediately.

I should have mentioned that and totally forgot. Please change your password and keys if you have done this and you will be fine

I would add this bit to your post to complete its greatness!

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