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This will happen, I believe, if the person has added their twitter name to their profile here, but, at Twitter, has their twitter-feed hidden from all but those who "follow" them. Something like that anyway. Something that pops up that dialog prompted by Twitter asking you to say who at Twitter you are, so they can check if you're authorized to read the Twitter posts (as displayed in the person's profile here).
Cheers,
Marc
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